%%% ソース始まり
\documentclass[a4j,11pt]{jreport}
\usepackage{amsmath,amsthm,amssymb}
\usepackage{emathPh,emathP,emathPp,ascmac,emath}
\begin{document}
\chapter{$\Deruta\neqq 0$}%%% これが通らない
\end{document}
%%% ソース終り

%%% 質問始まり
章のタイトルとして \chapter{$\Deruta\neqq 0$} を使いたいのですが、
上記のソースをコンパイルすると、以下のエラーメッセージを吐いて停止します。
解決法をご教示下さい。
%%% 質問終り

%%% エラーメッセージ始まり
This is pTeXk, Version 3.141592-p3.1.8 (sjis) (Web2C 7.5.5) (format=platex 2005.7.9)  26 JUL 2007 22:22
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LaTeX Font Info:    Checking defaults for OML/cmm/m/it on input line 5.
LaTeX Font Info:    ... okay on input line 5.
LaTeX Font Info:    Checking defaults for T1/cmr/m/n on input line 5.
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LaTeX Font Info:    ... okay on input line 5.

第 1 章
! Use of \@chapter doesn't match its definition.
<argument> \def \reserved@a {
                             \def \@currenvir {picture}\edef \@currenvline {...
l.6 \chapter{$\Deruta\neqq 0$}
                              
? X
 
Here is how much of TeX's memory you used:
 7215 strings out of 95549
 73722 string characters out of 1191184
 215868 words of memory out of 1500000
 10303 multiletter control sequences out of 10000+50000
 8370 words of font info for 35 fonts, out of 600000 for 2000
 14 hyphenation exceptions out of 2000
 53i,1n,27p,329b,47s stack positions out of 1500i,500n,5000p,200000b,5000s
No pages of output.
%%% エラーメッセージ終り

▼関連発言
│
└◆6313:\chapter と \Deruta [mrgm] 07/27 08:17
　└◆6314:Re:\chapter と \Deruta [トノ] 07/27 08:54<-last