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Anhinga anhinga playground
(Reply)
no subject
Date:
2006-07-15 04:38 pm (UTC)
From:
anhinga-drafts.livejournal.com
F
o
G
is a
projection
from
B
to the
F(A)
, where
F(A)
is a subset of
B
. A projection is a retraction
r
, such that
r(x) ≤ x
.
G
o
F
is a
retraction
from
A
to the
F(B)
, where
F(B)
is a subset of
A
. A
closure
operation is a retraction
r
, such that
x ≤ r(x)
.
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timeasmymeasuretimeasmymeasure
no subject
Date: 2006-07-15 04:38 pm (UTC)G o F is a retraction from A to the F(B), where F(B) is a subset of A. A closure operation is a retraction r, such that x ≤ r(x).