Mathlean · Online math workspace
Set membership calculator
Test whether an element belongs to a specified set.
How to use this calculator
Edit the element or the set. The starter asks whether 2 belongs to {1,2}.
Tap the math below to edit it and see the result. Once a result is ready, press Tab on a hardware keyboard to accept it. Outside a matrix, Return completes the line; the phone math keyboard has the same Return action.
Try it here
Interactive tools require JavaScript. You can read the guide and example without it.
What to know
Symbolic membership can remain undecided when assumptions are insufficient.
Mathlean combines visual mathematical input with computation and canvas tools. Results depend on the expression and available engine support; check important answers independently.