Adding a title to theorem environment

I am trying to use the theorem environment in my work as Sample Problem.

This is my MWE:

\documentclass{book}

\usepackage{amsthm}

\newtheoremstyle{mythmstyle}
{}{}{}{}
{\bf}
{}
{\newline}
{}
\theoremstyle{mythmstyle}
\newtheorem{mythm}{Sample Problem}[chapter]
\setcounter{chapter}{2}

\begin{document}
\chapter{New Chapter}
\begin{mythm}
Problem statement goes here. But, where does go title?
\end{mythm}
\end{document}


And the output,

Actually, I need something like this,

In other words, my Sample Problem lacks a Title.

How can I include a title within the theorem environment?

Here's a solution with thmtools, which eases defining new theorem styles:

\documentclass{book}
\usepackage[utf8]{inputenc} \usepackage{fourier, erewhon, cabin}
\usepackage[table, x11names]{xcolor} \usepackage{mathtools}
\usepackage{amsthm, thmtools}
\usepackage{microtype} \SetTracking[no ligatures = {f}]{encoding = *}{50}
\declaretheoremstyle[%
{sample}

\declaretheorem[name=Sample Problem, style=sample]{mypb}

\begin{document}

\setcounter{chapter}{3}

\begin{mypb}[Adding vectors in a drawing, orienteering]
Show the following assertion is true: %
\begin{equation*}
a = a
\end{equation*}
\end{mypb}

\end{document}


• thmtools package uses more understandable semantics than amsthm. Isn't it? – Shaqpad May 2 '16 at 15:43
• I agree with you. Amsthm is OK for simple modifications, but it's better to supplement it with thmtools for more complex layouts. Anyway, personally, I use ntheorem, which is also easier to customise and has an automatic placement of end-of-proof symbols. – Bernard May 2 '16 at 15:48

The title goes in squared brackets at the beginning of the theorem.

\begin{mythm}[Here goes the title]
Problem statement goes here. But, where does go title?
\end{mythm}


It doesn't look exactly what your example picture looks like, but as the "Sample Problem 3.1" text is bold making the title also bold wouldn't benefit readability.

• Could you please add a brief explanation? – ienissei May 2 '16 at 8:37
• yes, of course, I hoped it would be self explanatory. – BenjaminH May 2 '16 at 8:49
• @BenjaminH Thanks, but I guess this argument is for theorem source citation and the parentheses are redundant. – Shaqpad May 2 '16 at 8:50
• I've seen this usage a lot at my institute. Your question has been asked here and was answered the same way. So I suppose this is the way to go. – BenjaminH May 2 '16 at 9:08