macros/math.sty


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\ProvidesPackage{math}[
Simple shortcuts I use when write math]

\RequirePackage{amsmath}

% To write dx with an upright d and an italicized x, enter \d{x}.
% The format is variable agnostic.
\renewcommand*{\d}{\mathop{}\!\mathrm{d}}

% Upright character for Euler's constant using \e .
\newcommand*{\e}{\mathop{}\!\mathrm{e}}

% Makes variable changes for calculus easily explicit in align mode.
% cdv stands for "Changement de variable".
% Here is an example where u=sin(x) and du=-cos(x):
% \cdv{ u }{ \sin(x) }{ -\cos(x) }
% It will print out the words "Changement de variable" and make sure
% that equations such as u= and du= do not get numbered.
\newcommand*{\cdv}[3]{\mathop{}\!
  \mathrm{Changement\ de\ variable:}&\nonumber\\
  \ #1   &= #2\nonumber \\
  \d{#1} &= #3\nonumber
}