Thread:8emi95/@comment-38452727-20190517191351/@comment-37915141-20190618162107

Ah, thanks. I've studied math for 17 years but not in English (except for a few stray Google searches), otherwise I'd probably be familiar.

Is it okay if I re-add it as "if and only if" instead of "iff" in case someone else thinks it a typo too?