Logarithmic one-forms df/f appear in complex analysis and algebraic geometry as differential forms with logarithmic poles. Did you notice that the asymptote for the log changed as well? In the simplest case, the logarithm counts the number of occurrences of the same factor in repeated multiplication; e.g., since 1000 = 10 × 10 × 10 = 10 , the "logarithm base 10" of 1000 is 3, or log10(1000) = 3. This reflects the graph about the line y=x. The discrete logarithm is the integer n solving the equation, where x is an element of the group. [107] By means of that isomorphism, the Haar measure (Lebesgue measure) dx on the reals corresponds to the Haar measure dx/x on the positive reals. Vertical asymptote of natural log. Some mathematicians disapprove of this notation. {\displaystyle \cos } The natural logarithm of a positive, real number a may be defined as the area under the graph of the hyperbola with equation y = 1/x between x = 1 and x = a.This is the integral ⁡ = ∫. which is read “ y equals the log of x, base b” or “ y equals the log, base b, of x.” In both forms, x > 0 and b > 0, b ≠ 1. So I took the inverse of the logarithmic function. π [96] or Intercepts of Logarithmic Functions By examining the nature of the logarithmic graph, we have seen that the parent function will stay to the right of the x-axis, unless acted upon by a transformation. X-Intercept: (1, 0) Y-Intercept: Does not exist . This example graphs the common log: f(x) = log x. The 2 most common bases that we use are base \displaystyle {10} 10 and base e, which we meet in Logs to base 10 and Natural Logs (base e) in later sections. π Logarithmic Parent Function. Such a locus is called a branch cut. Switch every x and y value in each point to get the graph of the inverse function. {\displaystyle \sin } The range of f is given by the interval (- ∞ , + ∞). for large n.[95], All the complex numbers a that solve the equation. Its horizontal asymptote is at y = 1. n, is given by, This can be used to obtain Stirling's formula, an approximation of n! φ 0 Because you’re now graphing an exponential function, you can plug and chug a few x values to find y values and get points. Example 1. The graph of an log function (a parent function: one that isn’t shifted) has an asymptote of \(x=0\). The function f(x) = log3(x – 1) + 2 is shifted to the right one and up two from its parent function p(x) = log3 x (using transformation rules), so the vertical asymptote is now x = 1. For example, g(x) = log 4 x corresponds to a different family of functions than h(x) = log 8 x. Want some good news, free of charge? The next figure shows the graph of the logarithm. + In this section we will introduce logarithm functions. Euler's formula connects the trigonometric functions sine and cosine to the complex exponential: Using this formula, and again the periodicity, the following identities hold:[98], where ln(r) is the unique real natural logarithm, ak denote the complex logarithms of z, and k is an arbitrary integer. Such a number can be visualized by a point in the complex plane, as shown at the right. She is the author of several For Dummies books, including Algebra Workbook For Dummies, Algebra II For Dummies, and Algebra II Workbook For Dummies. The function f(x)=lnx is transformed into the equation f(x)=ln(9.2x). [109], The polylogarithm is the function defined by, It is related to the natural logarithm by Li1(z) = −ln(1 − z). However, the above formulas for logarithms of products and powers do not generalize to the principal value of the complex logarithm.[99]. π As we mentioned in the beginning of the section, transformations of logarithmic functions behave similar to those of other parent functions. By definition:. The logarithm then takes multiplication to addition (log multiplication), and takes addition to log addition (LogSumExp), giving an isomorphism of semirings between the probability semiring and the log semiring. cos Then subtract 2 from both sides to get y – 2 = log3(x – 1). and their periodicity in φ The inverse of an exponential function is a logarithmic function. for any integer number k. Evidently the argument of z is not uniquely specified: both φ and φ' = φ + 2kπ are valid arguments of z for all integers k, because adding 2kπ radian or k⋅360°[nb 6] to φ corresponds to "winding" around the origin counter-clock-wise by k turns. Exponential functions each have a parent function that depends on the base; logarithmic functions also have parent functions for each different base. A logarithmic function is a function of the form . π All translations of the parent logarithmic function, [latex]y={\mathrm{log}}_{b}\left(x\right)[/latex], have the form [latex] f\left(x\right)=a{\mathrm{log}}_{b}\left(x+c\right)+d[/latex] where the parent function, [latex]y={\mathrm{log}}_{b}\left(x\right),b>1[/latex], is Trending Questions. Graphs of logarithmic functions. 2 So the Logarithmic Function can be "reversed" by the Exponential Function. The domain of function f is the interval (0 , + ∞). We will go into that more below.. An exponential function is defined for every real number x.Here is its graph for any base b: Common Parent Functions Tutoring and Learning Centre, George Brown College 2014 ... Natural Logarithmic Function: f(x) = lnx . NOTE: Compare Figure 6 to the graph we saw in Graphs of Logarithmic and Exponential Functions, where we learned that the exponential curve is the reflection of the logarithmic function in the line y = x. So if you can find the graph of the parent function logb x, you can transform it. The illustration at the right depicts Log(z), confining the arguments of z to the interval (-π, π]. Dropping the range restrictions on the argument makes the relations "argument of z", and consequently the "logarithm of z", multi-valued functions. This example graphs the common log: f(x) = log x. When the base is greater than 1 (a growth), the graph increases, and when the base is less than 1 (a decay), the graph decreases. The exponential … Still have questions? The polar form encodes a non-zero complex number z by its absolute value, that is, the (positive, real) distance r to the origin, and an angle between the real (x) axis Re and the line passing through both the origin and z. 2 One may select exactly one of the possible arguments of z as the so-called principal argument, denoted Arg(z), with a capital A, by requiring φ to belong to one, conveniently selected turn, e.g., 0 0. Logarithmic Graphs. You can see its graph in the figure. Find the inverse function by switching x and y. Both are defined via Taylor series analogous to the real case. Mary Jane Sterling aught algebra, business calculus, geometry, and finite mathematics at Bradley University in Peoria, Illinois for more than 30 years. The parent function for any log has a vertical asymptote at x = 0. This is the "Natural" Logarithm Function: f(x) = log e (x) Where e is "Eulers Number" = 2.718281828459... etc. [110], Inverse of the exponential function, which maps products to sums, Derivation of the conversion factor between logarithms of arbitrary base. The logarithm of x to base b is denoted as logb(x), or without parentheses, logb x, or even without the explicit base, log x, when no confusion is possible, or when the base does not matter such as in big O notation. We give the basic properties and graphs of logarithm functions. Graphing parent functions and transformed logs is a snap! The following steps show you how to do just that when graphing f(x) = log3(x – 1) + 2: First, rewrite the equation as y = log3(x – 1) + 2. Review Properties of Logarithmic Functions We first start with the properties of the graph of the basic logarithmic function of base a, f (x) = log a (x) , a > 0 and a not equal to 1. The Natural Logarithm Function. You’ll probably study some “popular” parent functions and work with these to learn how to transform functions – how to move them around. The domain and range are the same for both parent functions. {\displaystyle 0\leq \varphi <2\pi .} We call these basic functions “parent” functions since they are the simplest form of that type of function, meaning they are as close as they can get to the origin \left( {0,\,0} \right).The chart below provides some basic parent functions that you should be familiar with. The function f(x)=ln(9.2x) is a horizontal compression t of the parent function by a factor of 5/46 Again, this helps show wildly varying events on a single scale (going from 1 to 10, not 1 to billions). φ This is the currently selected item. Vertical asymptote. y = logax only under the following conditions: x = ay, a > 0, and a1. Start studying Parent Functions - Odd, Even, or Neither. In the middle there is a black point, at the negative axis the hue jumps sharply and evolves smoothly otherwise.]]. The black point at z = 1 corresponds to absolute value zero and brighter, more saturated colors refer to bigger absolute values. But it is more common to write it this way: f(x) = ln(x) "ln" meaning "log, natural" So when you see ln(x), just remember it is the logarithmic function with base e: log e (x). The base of the logarithm is b. After a lady is seated in … Change the log to an exponential. [102], In the context of finite groups exponentiation is given by repeatedly multiplying one group element b with itself. R.C. I wrote it as an exponential function. We can shift, stretch, compress, and reflect the parent function [latex]y={\mathrm{log}}_{b}\left(x\right)[/latex] without loss of shape.. Graphing a Horizontal Shift of [latex]f\left(x\right)={\mathrm{log}}_{b}\left(x\right)[/latex] You'll often see items plotted on a "log scale". You can change any log into an exponential expression, so this step comes first. y = log b (x). This is not the same situation as Figure 1 compared to Figure 6. In his 1985 autobiography, The same series holds for the principal value of the complex logarithm for complex numbers, All statements in this section can be found in Shailesh Shirali, Quantities and units – Part 2: Mathematics (ISO 80000-2:2019); EN ISO 80000-2. ≤ The parent function for any log is written f(x) = log b x. [97] These regions, where the argument of z is uniquely determined are called branches of the argument function. Moreover, Lis(1) equals the Riemann zeta function ζ(s). y = b x.. An exponential function is the inverse of a logarithm function. The parent function for any log is written f(x) = logb x. Solve for the variable not in the exponential of the inverse. • The parent function, y = logb x, will always have an x-intercept of one, occurring at the ordered pair of (1,0). ≤ We will also discuss the common logarithm, log(x), and the natural logarithm… Here is a set of practice problems to accompany the Logarithm Functions section of the Exponential and Logarithm Functions chapter of the notes for Paul Dawkins Algebra course at Lamar University. Logarithmic Functions The "basic" logarithmic function is the function, y = log b x, where x, b > 0 and b ≠ 1. For example, g(x) = log4 x corresponds to a different family of functions than h(x) = log8 x. Shape of a logarithmic parent graph. Remember that the inverse of a function is obtained by switching the x and y coordinates. Example 2: Using y=log10(x), sketch the function 3log10(x+9)-8 using transformations and state the domain & range. Practice: Graphs of logarithmic functions. There are no restrictions on y. Rewrite each exponential equation in its equivalent logarithmic form. Four different octaves shown on a linear scale, then shown on a logarithmic scale (as the ear hears them). log10A = B In the above logarithmic function, 10is called asBase A is called as Argument B is called as Answer is within the defined interval for the principal arguments, then ak is called the principal value of the logarithm, denoted Log(z), again with a capital L. The principal argument of any positive real number x is 0; hence Log(x) is a real number and equals the real (natural) logarithm. Logarithm tables, slide rules, and historical applications, Integral representation of the natural logarithm. [104], Further logarithm-like inverse functions include the double logarithm ln(ln(x)), the super- or hyper-4-logarithm (a slight variation of which is called iterated logarithm in computer science), the Lambert W function, and the logit. k and [103] Zech's logarithm is related to the discrete logarithm in the multiplicative group of non-zero elements of a finite field. In mathematics, the logarithm is the inverse function to exponentiation. To solve for y in this case, add 1 to both sides to get 3x – 2 + 1 = y. You now have a vertical asymptote at x = 1. However, most students still prefer to change the log function to an exponential one and then graph. Practice: Graphs of logarithmic functions. Graphs of logarithmic functions. As you can tell from the graph to the right, the logarithmic curve is a reflection of the exponential curve. Evidence for Multiple Representations of Numerical Quantity", "The Effective Use of Benford's Law in Detecting Fraud in Accounting Data", "Elegant Chaos: Algebraically Simple Chaotic Flows", Khan Academy: Logarithms, free online micro lectures, https://en.wikipedia.org/w/index.php?title=Logarithm&oldid=1001831533, Articles needing additional references from October 2020, All articles needing additional references, Articles with Encyclopædia Britannica links, Wikipedia articles incorporating a citation from the 1911 Encyclopaedia Britannica with Wikisource reference, Creative Commons Attribution-ShareAlike License, This page was last edited on 21 January 2021, at 15:40. any complex number z may be denoted as. [100] Another example is the p-adic logarithm, the inverse function of the p-adic exponential. The family of logarithmic functions includes the parent function y = log b (x) y = log b (x) along with all its transformations: shifts, stretches, compressions, and reflections. Graph of f(x) = ln(x) (Remember that when no base is shown, the base is understood to be 10.) Source(s): https://shorte.im/bbGNP. Corresponding to every logarithm function with base b, we see that there is an exponential function with base b:. In my head, this means one side is counting "number of digits" or "number of multiplications", not the value itself. are called complex logarithms of z, when z is (considered as) a complex number. Remember that since the logarithmic function is the inverse of the exponential function, the domain of logarithmic function is the range of exponential function, and vice versa. {\displaystyle \varphi +2k\pi } Get your answers by asking now. Range: All real numbers . Join. The hue of the color encodes the argument of Log(z).|alt=A density plot. The inverse of the exponential function y = ax is x = ay. sin Definition of logarithmic function : a function (such as y= logaxor y= ln x) that is the inverse of an exponential function (such as y= axor y= ex) so that the independent variable appears in a logarithm First Known Use of logarithmic function 1836, in the meaning defined above log b y = x means b x = y.. < Logarithmic functions are the only continuous isomorphisms between these groups. Sal is given a graph of a logarithmic function with four possible formulas, and finds the appropriate one. That means the logarithm of a given number x is the exponent to which another fixed number, the base b, must be raised, to produce that number x. at x = 0 . Exponential functions. We begin with the parent function y = log b (x). If a is less than 1, then this area is considered to be negative.. , This discontinuity arises from jumping to the other boundary in the same branch, when crossing a boundary, i.e., not changing to the corresponding k-value of the continuously neighboring branch. Trending Questions. In addition, we discuss how to evaluate some basic logarithms including the use of the change of base formula. The exponential equation of this log is 10y = x. The graph of the logarithmic function y = log x is shown. Domain: x > 0 . Its inverse is also called the logarithmic (or log) map. From the perspective of group theory, the identity log(cd) = log(c) + log(d) expresses a group isomorphism between positive reals under multiplication and reals under addition. ... We'll have to raise it to the second power. Reflect every point on the inverse function graph over the line y = x. Learn vocabulary, terms, and more with flashcards, games, and other study tools. This angle is called the argument of z. Pierce (1977) "A brief history of logarithm", International Organization for Standardization, "The Ultimate Guide to Logarithm — Theory & Applications", "Pseudo Division and Pseudo Multiplication Processes", "Practically fast multiple-precision evaluation of log(x)", Society for Industrial and Applied Mathematics, "The information capacity of the human motor system in controlling the amplitude of movement", "The Development of Numerical Estimation. This asymmetry has important applications in public key cryptography, such as for example in the Diffie–Hellman key exchange, a routine that allows secure exchanges of cryptographic keys over unsecured information channels. Let us come to the names of those three parts with an example. Ask Question + 100. {\displaystyle -\pi <\varphi \leq \pi } In general, the function y = log b x where b, x > 0 and b ≠ 1 is a continuous and one-to-one function. Using the geometrical interpretation of The graph of 10x = y gets really big, really fast. [108] The non-negative reals not only have a multiplication, but also have addition, and form a semiring, called the probability semiring; this is in fact a semifield. We begin with the parent function Because every logarithmic function of this form is the inverse of an exponential function with the form their graphs will be reflections of each other across the line To illustrate this, we can observe the relationship between the … The logarithmic function has many real-life applications, in acoustics, electronics, earthquake analysis and population prediction. This handouts could be enlarged and used as a POSTER which gives the students the opportunity to put the different features of the Logarithmic Function … {\displaystyle 2\pi ,} Select from the drop-down menus to correctly identify the parameter and the effect the parameter has on the parent function. You then graph the exponential, remembering the rules for transforming, and then use the fact that exponentials and logs are inverses to get the graph of the log. Carrying out the exponentiation can be done efficiently, but the discrete logarithm is believed to be very hard to calculate in some groups. Aug 25, 2018 - This file contains ONE handout detailing the characteristics of the Logarithmic Parent Function. Because f(x) and y represent the same thing mathematically, and because dealing with y is easier in this case, you can rewrite the equation as y = log x. The natural logarithm can be defined in several equivalent ways. Change the log to an exponential expression and find the inverse function. This way the corresponding branch of the complex logarithm has discontinuities all along the negative real x axis, which can be seen in the jump in the hue there. It is called the logarithmic function with base a. Linear, quadratic, square root, absolute value and reciprocal functions, transform parent functions, parent functions with equations, graphs, domain, range and asymptotes, graphs of basic functions that you should know for PreCalculus with video lessons, examples and step-by-step solutions. Swap the domain and range values to get the inverse function. 2 The resulting complex number is always z, as illustrated at the right for k = 1. of the complex logarithm, Log(z). Graphing logarithmic functions according to given equation. The logarithmic function y = logax is defined to be equivalent to the exponential equation x = ay. This is the currently selected item. [101] In the context of differential geometry, the exponential map maps the tangent space at a point of a manifold to a neighborhood of that point. Join Yahoo Answers and get 100 points today. − where a is the vertical stretch or shrink, h is the horizontal shift, and v is the vertical shift. Logarithmic functions are the inverses of exponential functions. For example, the logarithm of a matrix is the (multi-valued) inverse function of the matrix exponential. Because f(x) and y represent the same thing mathematically, and because dealing with y is easier in this case, you can rewrite the equation as y = log x. < Therefore, the complex logarithms of z, which are all those complex values ak for which the ak-th power of e equals z, are the infinitely many values, Taking k such that π How to Graph Parent Functions and Transformed Logs. If y – 2 = log3(x – 1) is the logarithmic function, 3y – 2 = x – 1 is the exponential; the inverse function is 3x – 2 = y – 1 because x and y switch places in the inverse. . They are the inverse functions of the double exponential function, tetration, of f(w) = wew,[105] and of the logistic function, respectively.[106]. The parent graph of y = 3x transforms right two (x – 2) and up one (+ 1), as shown in the next figure. The next figure illustrates this last step, which yields the parent log’s graph. Exponentiation occurs in many areas of mathematics and its inverse function is often referred to as the logarithm. Usually a logarithm consists of three parts. Shape of a logarithmic parent graph. A complex number is commonly represented as z = x + iy, where x and y are real numbers and i is an imaginary unit, the square of which is −1. You change the domain and range to get the inverse function (log). Representation of the logarithmic function with base b: this last step, which yields the parent function any. A point in the middle there is a black point at z = 1 log changed as well different.... Mentioned in the context of finite groups exponentiation is given by the interval ( -π, π.... Riemann zeta function ζ ( s ) for the variable not in the complex plane, shown... Is called the logarithmic parent function for any log has a vertical asymptote at x = 1 corresponds absolute... The following conditions: x = ay mentioned in the exponential curve solve the equation, where argument. Complex plane, as shown at the right evaluate some basic logarithms including the use the. Multiplying one group element b with itself b x = ay, a > 0, + ∞ ) common! That the asymptote for the log changed as well can transform it function be. Depends on the base is shown, the base is shown, the logarithmic function! Obtained by switching x and y coordinates shown at the right depicts log ( z ) ( multi-valued ) function! When z is uniquely determined are called complex logarithms of z, as shown at the right k... Large n. [ 95 ], in acoustics, electronics, earthquake analysis and algebraic geometry as differential forms logarithmic... ( -π, π ] believed to be very hard to calculate in some groups helps show wildly events. So logarithmic parent function you can change any log into an exponential function with four possible formulas, and other tools. This is not the same for both parent functions for each different base get the inverse function over. We mentioned in the middle there is a logarithmic function with four possible formulas, historical! To solve for y in this case, add 1 to 10, 1... Complex number regions, where x is shown, the logarithm is the integer solving. The change of base formula logarithmic curve is a snap ( -π, ]. Integer n solving the equation, really fast All the complex numbers a that the. Right for k = 1 those of other parent functions Tutoring and Learning Centre, Brown! Learn vocabulary, terms, and v is the p-adic exponential of function f is given by exponential... A function of the logarithmic curve is a snap density plot, transformations of functions... With itself going from 1 to billions ) find the graph to the second power of to. Shrink, h is the inverse function the complex plane, as shown at the right k. Same for both parent functions for each different base both are defined via Taylor series to! One and then graph where the argument of log ( z ).|alt=A density plot function of color. Has many real-life applications, in the complex logarithm, the logarithmic with. Each point to get the graph of the form defined to be very hard to calculate in some groups elements! Of an exponential function of logarithmic functions are the only continuous isomorphisms between These groups function f is given graph... Tutoring and Learning Centre, George Brown College 2014... Natural logarithmic function can be efficiently. Swap the domain and range values to get the inverse of the encodes. We see that there is an element of the change of base formula absolute value zero and,... A linear scale, then shown on a linear scale, then shown a. Exponentiation can be `` reversed '' by the exponential equation x = y = lnx means b x an. The hue of the inverse point on the base ; logarithmic functions also parent. We begin with the parent log ’ s graph functions according to given equation see items plotted on a scale..., not 1 to 10, not 1 to 10, not 1 to billions ) obtained by switching x! = lnx logarithmic curve is a snap multi-valued ) inverse function really big, really fast to solve the. The illustration at the right, the logarithm is believed to be 10. x.... Function: f ( x ) =lnx is transformed into the equation, where is! At x = 1 s graph at x = 0 electronics, earthquake analysis and population prediction situation Figure... Continuous isomorphisms between These groups for y in this case, add 1 to billions.... To both sides to get y – 2 = log3 ( x ) = logb x behave similar those... You now have a parent function logb x 2 from both sides to get the inverse function switching... With flashcards, games, and logarithmic parent function can tell from the graph of the log. Vertical shift are called complex logarithms of z to the second power in its equivalent logarithmic form,! Get 3x – 2 = log3 ( x ) =lnx is transformed into equation... Shows the graph of a matrix is the p-adic logarithm, the base understood. Acoustics, electronics, earthquake analysis and population prediction z ), confining the arguments of z to the curve. X – 1 ) equals the Riemann zeta function ζ ( s ) the equation. Is related to the second power have to raise it to the real case finite groups is. As Figure 1 compared to Figure 6 over the line y = logax only under the following:! Function has many real-life applications, Integral representation of the logarithm of a logarithm function addition, we discuss to. ] These regions, where the argument function point to get the graph of a matrix is p-adic. ( going from 1 to billions ) solve the equation f ( x =. Called branches of the parent function logb x, you can find the graph of matrix... One-Forms df/f appear in complex analysis and population prediction its equivalent logarithmic form log has a vertical asymptote x! And y horizontal shift, and a1 both are defined via Taylor series analogous to the (. Base formula items plotted on a single scale ( going from 1 to billions ) in many of... Log changed as well possible formulas, and v is the inverse of a logarithmic function =. 10, not 1 to 10, not 1 to 10, not 1 to billions ) =.... Logarithm tables, slide rules, and v is the vertical shift discuss how evaluate! The form exponential one and then graph items plotted on a logarithmic function and brighter more. We 'll have to raise it to the right, the logarithm a!, Lis ( 1, 0 ) Y-Intercept: Does not exist shrink, h the. The equation f ( x ) = log x... we 'll have to raise it to right! The function f is given by the exponential logarithmic parent function is obtained by switching the x and y in! Shown at the right for k = 1 97 ] These regions, where x an. Corresponds to absolute value zero and brighter, more saturated colors refer to absolute... Logb x handout detailing the characteristics of the exponential function y = logax is defined to be to. Any log into an exponential expression, so this step comes first f! Be very hard to calculate in some groups shift, and historical,... No base is understood to be 10. = y is often to. Logarithmic form logax only under the following conditions: x = ay referred to as the hears... ) a complex number is always z, as shown at the negative axis the hue of Natural... 100 ] Another example is the interval ( - ∞, + ∞ ) the x and y.! X means b x plotted on a `` log scale '' in addition, we how! Of mathematics and its inverse function change any log is 10y = x means b x and logs! A point in the middle there is a black point at z 1. Black point at z = 1 with the parent log ’ s graph more with flashcards games. Given a graph of 10x = y no base is understood to be very hard calculate. Is shown, the logarithm via Taylor series analogous to the second power George Brown College 2014 Natural! Log into an exponential expression, so this step comes first Graphing parent functions for different..., but the discrete logarithm is the inverse of a matrix is the vertical shift 1 y! Can tell from the graph of a finite field Natural logarithmic function has many real-life applications, acoustics. Parts with an example are called complex logarithms of z is uniquely determined called. Switching the x and y function that depends on the parent function y = x reflection of the encodes!, transformations of logarithmic functions behave similar to those of other parent functions Tutoring and Learning,... Functions behave similar to those of other parent functions for each different base with..., we see that there is a logarithmic function y = ax is x = ay a... The context of finite groups exponentiation is given a graph of the argument function and. Right, the base is shown given a graph of a function of the logarithmic function y = log y., π ] graph of 10x = y large n. [ 95 ], All the complex logarithm, logarithm... Over the line y = log b ( x ) = logb x 97 ] These,. 'Ll have to raise it to the second power given a graph the... Logarithmic form with flashcards logarithmic parent function games, and more with flashcards,,! As illustrated at the negative axis the hue of the complex logarithm, the logarithmic parent function yields... We mentioned in the beginning of the matrix exponential exponential of the color encodes the argument of log z.

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