निरंजन
Consider the following MWE. I want to print chapter names and section names there. Is it possible to do it without the labels? I tried \chaptermark and \sectionmark, but they don't seem to work. Is there any other possible way to do it?


\documentclass{memoir}
\usepackage{fancyhdr}
\usepackage{lipsum}
\pagestyle{fancy}

\begin{document}
\chapter{abcd}
\lipsum[1-1]
\section{efgh}
\lipsum
\chapter{pqrs}
\lipsum[1-1]
\section{wxyz}
\lipsum
\end{document}

samcarter
You don't need the fancyhdr package, memoir provides its own mechanism for headings:


\documentclass{memoir}
\usepackage{lipsum}

\begin{document}
\chapter{abcd}
\lipsum[1-1]
\section{efgh}
\lipsum
\chapter{pqrs}
\lipsum[1-1]
\section{wxyz}
\lipsum
\end{document}


![Screen Shot 2020-11-29 at 15.09.00.png](/image?hash=0dfb6c0ea11d8acde400d465c6efe9b005363d981f86d378462d876f39613a5c)

(although memoir is two sided by default, so I would suggest to switch the positions for even and odd pages)
user 3.14159
You can use \sectionmark and \chaptermark to redefine \rhead and \lhead to contain, say, the title of the section or chapter, respectively.

\documentclass{memoir}
\usepackage{fancyhdr}
\usepackage{lipsum}
\pagestyle{fancy}
\begin{document}
\chapter{abcd}
\lipsum[1-1]
\section{efgh}
\lipsum
\chapter{pqrs}
\lipsum[1-1]
\section{wxyz}
\lipsum
\end{document}

![ani.gif](/image?hash=fc2a6f8a94458a473793e31630e6c30e1fde4d1d035a01894ce8a32b6ce7d0ce)

Here is an improved version with a lot of help from @samcarter. It is essentially copied from the top of p. 19 of the fancyhdr manual.

\documentclass{memoir}
\usepackage{fancyhdr}
\usepackage{lipsum}
\pagestyle{fancy}
\renewcommand{\chaptermark}[1]{\markboth{#1}{}}
\renewcommand{\sectionmark}[1]{\markright{#1}}
\begin{document}
\chapter{pqrs}
\lipsum

\vspace{10\baselineskip}
aaaa
\section{wxyz}
\lipsum
\chapter{abcd}
\lipsum[1-1]
\section{efgh}
\lipsum
\chapter{pqrs}
\lipsum[1-1]
\section{wxyz}
\lipsum
\end{document}

![ani.gif](/image?hash=29346f81e6a64f5d235ee554e5e4f638d4725a11bb72fb79417acdd1ac0a8093)

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