+
+\cs_set_eq:NN \ltj_orig_fontspec_setup_maths: \fontspec_setup_maths:
+\cs_set:Nn \fontspec_setup_maths:
+ {
+ \group_begin:
+ \cs_set:Npn \DeclareMathSymbol##1##2##3##4{%
+ \expandafter\in@\csname sym##3\expandafter\endcsname
+ \expandafter{\group@list}%
+ \ifin@
+ \begingroup
+ \count\z@=##4\relax
+ \count\tw@\count\z@
+ \divide\count\z@\sixt@@n
+ \count@\count\z@
+ \multiply\count@\sixt@@n
+ \advance\count\tw@-\count@
+ \if\relax\noexpand##1% is command?
+ \edef\reserved@a{\noexpand\in@{\string\mathchar}{\meaning##1}}%
+ \reserved@a
+ \ifin@
+ \expandafter\set@mathsymbol
+ \csname sym##3\endcsname##1##2%
+ {\hexnumber@{\count\z@}\hexnumber@{\count\tw@}}%
+ \@font@info{Redeclaring math symbol \string##1}%
+ \else
+ \expandafter\set@mathsymbol
+ \csname sym##3\endcsname##1##2%
+ {\hexnumber@{\count\z@}\hexnumber@{\count\tw@}}%
+ \fi
+ \else
+ \expandafter\set@mathchar
+ \csname sym##3\endcsname##1##2
+ {\hexnumber@{\count\z@}\hexnumber@{\count\tw@}}%
+ \fi
+ \endgroup
+ \else
+ \@latex@error{Symbol font `##3' is not defined}\@eha
+ \fi
+ }
+ \ltj_orig_fontspec_setup_maths:
+ \group_end:
+ }