Should the Euler constant (or exponential constant) $$e$$ be typeset in italics or non-italics (\text), per mathematical convention and also best practice for mathematical typography?
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1This is a matter of opinion, and is between you and your advisor, editor, or publisher. – Xander Henderson Oct 25 '20 at 14:25
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In my opinion it should be used in italics itself.
Because all the constants (of 1 letter) are italicized like,
$c$ - speed of light
$k$ - Boltzmann constant
$R$ - gas constant
and so on.
$e$ although transcendental, is a constant. So it should be italicized. But when we write it as functions like $\sin$, $\log$, $\arg$, $\arccos$, it should be non-italicized- $\color{blue}{\exp}$
19aksh
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