math_not_closed.texi:8: warning: @chapter should not appear in @math
math_not_closed.texi:7: @chapter seen before @math closing brace
math_not_closed.texi:11: warning: @bye should not appear in @math
math_not_closed.texi:10: @bye seen before @math closing brace
texexpand 
math_not_closed.texi: warning: must specify a title with a title command or @top
