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I want to put an endmark in the solution environment, I tried

\section{Section one}
If \(U\) or \(V\) then...

The Proof
            Ax = b.

This is a example
This is a solution

How do I write a command in the preamble to put an endmark in the solution environment?

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up vote 3 down vote accepted

Use this


Then you just write your solutions with the environment mysol.

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