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Currently, texvc renders <math>A-B</math> with a hyphen (" - ") instead of a
minus sign (" &minus; ").  Use of the minus sign should be preferred for math
display.  The following diff will fix this by adding one line to the lexer:

# cvs diff -u
cvs diff: Diffing .
Index: lexer.mll
===================================================================
RCS file: /cvsroot/wikipedia/phase3/math/lexer.mll,v
retrieving revision 1.2
diff -u -r1.2 lexer.mll
--- lexer.mll   19 May 2003 22:40:16 -0000      1.2
+++ lexer.mll   26 Feb 2005 00:20:35 -0000
@@ -47,6 +47,7 @@
   | literal_mn                 { let str = Lexing.lexeme lexbuf in LITERAL
(MHTMLABLEC (FONT_RM, str,str,MN,str)) }
   | literal_uf_lt              { let str = Lexing.lexeme lexbuf in LITERAL
(HTMLABLEC (FONT_UFH, str,str)) }
   | delimiter_uf_lt            { let str = Lexing.lexeme lexbuf in DELIMITER
(HTMLABLEC (FONT_UFH, str,str)) }
+  | "-"                         { LITERAL (HTMLABLE (FONT_UFH,"-"," &minus; "))}
   | literal_uf_op              { let str = Lexing.lexeme lexbuf in LITERAL
(MHTMLABLEC (FONT_UFH, str," "^str^" ",MO,str)) }
   | delimiter_uf_op            { let str = Lexing.lexeme lexbuf in DELIMITER
(MHTMLABLEC (FONT_UFH, str," "^str^" ",MO,str)) }
   | "\\" alpha +               { Texutil.find (Lexing.lexeme lexbuf) }