Macros with \fi for showing and hiding proofs

Question

I would like to be able to globally showing and hiding proofs on a document, and be able to use macros to open and close the proof environments. Here is my current MWE:

\documentclass{article}
\usepackage{amsmath}
\usepackage{amsthm}
\newif\ifshowproof
\newcommand{\bp}{\ifshowproof\begin{proof}}
\newcommand{\ep}{\end{proof}}
\showprooffalse

\begin{document}
Goodbye.
\bp
Hello.
\ep\fi
Test.
\end{document}

As explored here: newcommand does not work with \fi, I cannot simply add \fi to the definition of \ep, however, I would like to have a "catch-all" macro so to say, that is, ideally something that would execute as \end{proof}\fi. Is there an easy way to do this?

related: question 173118 – barbara beeton Apr 25 '14 at 05:08 — barbara beeton, Apr 25 '14 at 05:08

score 0 · Answer 1 · edited Jun 10 '20 at 12:32

0

I would just use a \NewEnviron to define a Proof environment that does what you want:

enter image description here

Code:

\documentclass{article}
\usepackage{amsmath}
\usepackage{amsthm}
\usepackage{environ}
\newif\ifshowproof
\showprooffalse
\NewEnviron{Proof}{%
    \ifshowproof%
        \begin{proof}%
            \BODY
        \end{proof}%
    \fi%
}%
\begin{document}
Goodbye.
\begin{Proof}
Hello.
\end{Proof}
Test.
\showprooftrue
Goodbye.
\begin{Proof}
Hello.
\end{Proof}
Test.
\end{document}

edited Jun 10 '20 at 12:32

Community

1

answered Apr 25 '14 at 03:50

Peter Grill

223,288

I've seen them before, but out of curiosity, what do the % at the end of each line for the Proof definition do? – Abe Schulte Apr 25 '14 at 04:05
Additionally, when I try to add \newcommand{\bp}{\begin{proof}} and \newcommand{\ep}{\end{proof}}, the environment displays regardless of the setting on \ifshowproof. – Abe Schulte Apr 25 '14 at 04:08
@AbeSchulte: Well ever since Tex Capacity Exceeded (if remove % after use of macro) I have gotten into the habit of adding `% at the end of a line, even when it is not absolutely necessary. There are a few cases where this is a problem but I have not run into them. See When is it harmful to add percent character at end of lines in a \newcommand, or similar. – Peter Grill Apr 25 '14 at 04:08
@AbeSchulte: I have a feeling that the environ package needs to see the \end{Proof} directly, and not a macro that means \end{Proof}. – Peter Grill Apr 25 '14 at 04:29
In that case, do you happen to know of another solution that does allow for macros? – Abe Schulte Apr 25 '14 at 04:32
I don't, but others might. You could always just get your text editor to expand the text to the \begin{Proof} ... \end{Proof} environment. – Peter Grill Apr 25 '14 at 04:36
let us continue this discussion in chat – Abe Schulte Apr 25 '14 at 05:14

Macros with \fi for showing and hiding proofs

1 Answers1

Code: