1 Answer

Frank Fu · Answer 1 · 2020-11-16T17:12:04+0000

A set
is closed under multiplication if for any two elements of
, say
$a,b\in X$ , we also have their product
$ab\in X$ . (
and
can be the same element)

The set
$C=\{0,1,3\}$ is not closed, because 3*3=9 does not belong to
.

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