Strange error defining a macro with arguments for math mode












0















When I delete the second item, it compiles fine. However, with the second item, I get ERROR: Missing $ inserted and the math renders incorrectly:



documentclass[12pt]{article}

newcommand frob[2] {langle #1,#2 rangle_F}

begin{document}
begin{itemize}

item What I want: $
langle A,B rangle_F
geq
langle C,D rangle_F
$.

item What I get: $
frob{A,B}
geq
frob{A,B}
$.

end{itemize}
end{document}


the issue



Would appreciate any help with this issue!










share|improve this question























  • Don't use frob as frob{A,B} but use it as frob{A}{B}. Your frob-macro does process two arguments which are not comma-separated. As result it delivers something where the phrases delivered as arguments will be comma-separated. Maybe this confused you. ;-) If you do frob{A,B}geq, frob's first undelimited argument will be formed from {A,B} and frob's second undelimited argument will be formed from geq.

    – Ulrich Diez
    2 mins ago
















0















When I delete the second item, it compiles fine. However, with the second item, I get ERROR: Missing $ inserted and the math renders incorrectly:



documentclass[12pt]{article}

newcommand frob[2] {langle #1,#2 rangle_F}

begin{document}
begin{itemize}

item What I want: $
langle A,B rangle_F
geq
langle C,D rangle_F
$.

item What I get: $
frob{A,B}
geq
frob{A,B}
$.

end{itemize}
end{document}


the issue



Would appreciate any help with this issue!










share|improve this question























  • Don't use frob as frob{A,B} but use it as frob{A}{B}. Your frob-macro does process two arguments which are not comma-separated. As result it delivers something where the phrases delivered as arguments will be comma-separated. Maybe this confused you. ;-) If you do frob{A,B}geq, frob's first undelimited argument will be formed from {A,B} and frob's second undelimited argument will be formed from geq.

    – Ulrich Diez
    2 mins ago














0












0








0








When I delete the second item, it compiles fine. However, with the second item, I get ERROR: Missing $ inserted and the math renders incorrectly:



documentclass[12pt]{article}

newcommand frob[2] {langle #1,#2 rangle_F}

begin{document}
begin{itemize}

item What I want: $
langle A,B rangle_F
geq
langle C,D rangle_F
$.

item What I get: $
frob{A,B}
geq
frob{A,B}
$.

end{itemize}
end{document}


the issue



Would appreciate any help with this issue!










share|improve this question














When I delete the second item, it compiles fine. However, with the second item, I get ERROR: Missing $ inserted and the math renders incorrectly:



documentclass[12pt]{article}

newcommand frob[2] {langle #1,#2 rangle_F}

begin{document}
begin{itemize}

item What I want: $
langle A,B rangle_F
geq
langle C,D rangle_F
$.

item What I get: $
frob{A,B}
geq
frob{A,B}
$.

end{itemize}
end{document}


the issue



Would appreciate any help with this issue!







math-mode macros






share|improve this question













share|improve this question











share|improve this question




share|improve this question










asked 14 mins ago









Elliot GorokhovskyElliot Gorokhovsky

348112




348112













  • Don't use frob as frob{A,B} but use it as frob{A}{B}. Your frob-macro does process two arguments which are not comma-separated. As result it delivers something where the phrases delivered as arguments will be comma-separated. Maybe this confused you. ;-) If you do frob{A,B}geq, frob's first undelimited argument will be formed from {A,B} and frob's second undelimited argument will be formed from geq.

    – Ulrich Diez
    2 mins ago



















  • Don't use frob as frob{A,B} but use it as frob{A}{B}. Your frob-macro does process two arguments which are not comma-separated. As result it delivers something where the phrases delivered as arguments will be comma-separated. Maybe this confused you. ;-) If you do frob{A,B}geq, frob's first undelimited argument will be formed from {A,B} and frob's second undelimited argument will be formed from geq.

    – Ulrich Diez
    2 mins ago

















Don't use frob as frob{A,B} but use it as frob{A}{B}. Your frob-macro does process two arguments which are not comma-separated. As result it delivers something where the phrases delivered as arguments will be comma-separated. Maybe this confused you. ;-) If you do frob{A,B}geq, frob's first undelimited argument will be formed from {A,B} and frob's second undelimited argument will be formed from geq.

– Ulrich Diez
2 mins ago





Don't use frob as frob{A,B} but use it as frob{A}{B}. Your frob-macro does process two arguments which are not comma-separated. As result it delivers something where the phrases delivered as arguments will be comma-separated. Maybe this confused you. ;-) If you do frob{A,B}geq, frob's first undelimited argument will be formed from {A,B} and frob's second undelimited argument will be formed from geq.

– Ulrich Diez
2 mins ago










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