How to say x is not an element of a set and/or ask if it is

Cyrille
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I would like to know if there is are keyword to verify if x is an element or not of the set X ?

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Ben, juste x in X ? et x not in X aussi.

Ok I was expecting !in. This is the reason why I have not found it by myself Thanks

Cyrille ( 2020-09-24 22:51:35 +0200 )edit

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Asked: 2020-09-24 16:40:07 +0200

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Last updated: Sep 24 '20