I don't know anything about mathml, but "math" tags are still working.

-Dan

Not for me they are not, and apparantly not for some others.

I can no longer see many of the maths formulae I used to be able to here for example you 'Tex' post and my previous 'test' post on the subject.

None of the 'tricks', like refreshing or leaving a thread and returning work any longer.

mathml stands for 'mathematics markup language' which is the maths equivalent of html or hypertext markup language.

The mathml tags are the tags you have been recommending.

For some reason the parser on this site now removes these and substitutes a $ sign and the words 'display style'