[OS X TeX] ``\mathit allowed only in math mode'' error while writing .idx

Murray Eisenberg murrayeisenberg at gmail.com
Mon Feb 10 15:55:28 EST 2020

In source:

	\index{Urysohn Metrization Theorem}

in one location and

	\index{Urysohn Metrization Theorem|mainref}

in another location (with \mainref defined as specified in my original message).

I’m using memoir documentclass with 


Indexing from:

  	  colorlinks, citecolor=red, filecolor=black, linkcolor=blue, urlcolor=blue,

Is there anything else I can supply, short of the entire, approximately 2.5 MB, folder tree of files, that might help you help me? 

> On 10 Feb2020, at 3:20 PM, Herbert Schulz <herbs at wideopenwest.com> wrote:
>> On Feb 10, 2020, at 12:35 PM, Murray Eisenberg <murrayeisenberg at gmail.com> wrote:
>> I’m looking for any possible clues in trying to track down the error with pdflatex
>>  \mathit allowed only in math mode
>> encountered while latexmk is writing .idx.
>> This is occurring, in the first instance with .ind entry
>> 	\item \idxmark{Urysohn Metrization Theorem}, \hyperpage{506}, 
>> 		\mainref{580}
>> The function \mainref is defined as:
>> 	\newcommand{\mainref}[1]{\textbf{\emph{\hyperpage{#1}}}}
>> But the error occurs even if I change \mainref to: \newcommand{\mainref}[1]{#1}
>> The document’s .ist file includes
>> 	item_0  "\n\\item \\idxmark{"
>>   	delim_0 "}, "
>> where \idxmark is defined in my preamble by:
>> 	\providecommand\gobbleone[1]{}
>> 	\newcommand{\idxmark}[1]{{\let\gobbleone\relax\markboth{\sffamily\bfseries#1}{\sffamily\bfseries#1}}#1}
>> If I comment out the \index entries for that “Urysohn Metrization Theorem”, then the same error occurs for other entries.
>> I APOLOGIZE for not providing a complete, minimal working example for reproducing the error, but I think some clue might help me devise such. The document in question is of book length, with a complex source structure that includes several style files constituting the preamble.
>> NOTE: This error did not occur a week or two ago, despite no change to my preamble. So I think something has changed in some latex package to cause this.
>> ---
>> Murray Eisenberg			murrayeisenberg at gmail.com
> Howdy,
> What does that entry look like in the source file? Are you using any particular indexing package? Not that I'm on to anything :-(.
> Good Luck,
> Herb Schulz
> (herbs at wideopenwest dot com)
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Murray Eisenberg			murrayeisenberg at gmail.com
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