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26A06-DifferenceQuotient.tex
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26A06-DifferenceQuotient.tex
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\documentclass[12pt]{article}
\usepackage{pmmeta}
\pmcanonicalname{DifferenceQuotient}
\pmcreated{2013-03-22 17:30:46}
\pmmodified{2013-03-22 17:30:46}
\pmowner{pahio}{2872}
\pmmodifier{pahio}{2872}
\pmtitle{difference quotient}
\pmrecord{4}{39903}
\pmprivacy{1}
\pmauthor{pahio}{2872}
\pmtype{Definition}
\pmcomment{trigger rebuild}
\pmclassification{msc}{26A06}
\pmclassification{msc}{30A99}
\pmrelated{Derivative2}
\pmrelated{Slope}
\pmrelated{SecondDerivativeAsSimpleLimit}
\endmetadata
% this is the default PlanetMath preamble. as your knowledge
% of TeX increases, you will probably want to edit this, but
% it should be fine as is for beginners.
% almost certainly you want these
\usepackage{amssymb}
\usepackage{amsmath}
\usepackage{amsfonts}
% used for TeXing text within eps files
%\usepackage{psfrag}
% need this for including graphics (\includegraphics)
%\usepackage{graphicx}
% for neatly defining theorems and propositions
\usepackage{amsthm}
% making logically defined graphics
%%%\usepackage{xypic}
% there are many more packages, add them here as you need them
% define commands here
\theoremstyle{definition}
\newtheorem*{thmplain}{Theorem}
\begin{document}
The {\em difference quotient}
$$\frac{f(z+\Delta{z})-f(z)}{\Delta{z}}$$
of a \PMlinkname{complex}{ComplexFunction} or real function $f$ is the ratio of the change of the function to the corresponding change of the variable.
The difference quotient is needed in defining the derivative of the function. In the case of a real function $f$ the difference quotient may be interpreted as the slope of a secant line of the graph of the function.
%%%%%
%%%%%
\end{document}