تاريخ : برچسب:, | | نویسنده : ارمین
10.1 Definition.
A collection of open sets
{
U
i
:
i
I
}
in
X
is an
open
cover
of
Y
X
if
Y
⊂∪
i
I
U
i
. A
subcover
of
{
U
i
:
i
I
}
is a subcollection
{
U
j
:
j
J
}
for some
J
I
that still covers
Y
. It is a
finite subcover
if
J
is finite.


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