what does the inverse membership symbol means?

$\begingroup$

I know that the symbol $$ \in $$ stands for membership, but what does the symbol $$ \ni $$ stand for?

Because I know that in the set membership, one symbol stands for subset and the other ones for superset, but I cannot find the meaning of the other symbol

Thanks

$\endgroup$ 2

2 Answers

$\begingroup$

Because $a < b$ means the same thing as $b > a$ and $A \subset B$ means the same thing as $B \supset A$, one should not use the mirror image of $\in$ to mean "such that". It is a bad, confusing notation.

$\endgroup$ $\begingroup$

Sometimes you want to write the set before the element. $A \ni x$ means exactly the same as $x \in A$.

$\endgroup$

Your Answer

Sign up or log in

Sign up using Google Sign up using Facebook Sign up using Email and Password Submit

Post as a guest

Post Your Answer Discard

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy