[isabelle] Underscore vs Hyphen in Document Preparation

Dear Isabelle Users,

Documents generated with Isabelle build tool
produce an hyphen instead of an underscore whenever the
later is used in identifiers and concrete syntax annotation.

I think this is (a bit) unfortunate as a  choice for a default definition.

After a brief inspection of the isabelle.sty file, I added the
following workaround to my prelude.tex file:


It works, but it I wonder if this is the proper way.

Thanks for any comments on that!
Alfio Ricardo Martini
PhD in Computer Science (TU Berlin)
Lattes:  http://lattes.cnpq.br/4016080665372277
Associate Professor at Faculty of Informatics (PUCRS)
Av. Ipiranga, 6681 - Prédio 32 - Faculdade de Informática
90619-900 -Porto Alegre - RS - Brasil

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