Mathematicians often use

$a, b\in M$

to announce that a and b are elements of the set M.

Sometimes, one wants to replace the "\in"-symbol by the English word "in" – for example when one tries to reduce the usage of symbols in order to improve readability.

Question: Would you use

Let $a, b$ in $M$


Let $a$, $b$ in $M$


  • Let $a$, $b$ in $M$. – Jérôme Dequeker Jul 27 '16 at 13:03
  • In either case, use $M$. – Karlo Jul 27 '16 at 13:03
  • Karlo: Yes, I meant that. Just edited the question. Thanks for the comment. – ewuwuw Jul 27 '16 at 13:04
  • I'd use $a,b$ in $M$. I think this is off topic though. – Hugh Jul 27 '16 at 13:05
  • 3
    Related: $a,\ b$, and $c$ vs. $a$, $b$, and $c$ – cgnieder Jul 27 '16 at 13:55

Browse other questions tagged or ask your own question.