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Theorem:- For aspace X, the F.A.E: (1) x is a T_(2) -space. let y be any point of x then for every x!=y,EE an open
Theorem:-\ For aspace X, the F.A.E:\ (1)
x
is a
T_(2)
-space.\ let
y
be any point of
x
then for every
x!=y,EE
an open set
V
containing
y
s.t
x!i(n)/(b)ar (V)
\ (3) The diagonal set
\\\\Delta ={(x,x)/(x)inx}
is a closed subset in
x\\\\times x
.\ (4) and
U
is open
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