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Sets and containment

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Note:
C = containment
int = interior
ext = exterior
cl = closure

Could you please prove if S C T, then
a)int(S) C int(T)
b)ext(T) C ext(S)
c)cl(S) C cl(T)

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Solution Summary

This is a set regarding containment and closure.

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S C T means S is a subset of T.
Proof:
(a) for any x in int(S), x is an interior point of S, this means we can find an open set U which contains x and U belongs to S. But S belongs to T. So U also belongs to T. Thus x is an ...

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