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Solution
ID: past-exam-of-the-options-i-course-of-the-university-of-oxford/2010/e/e2/a/ii/solution
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Past exam of the options I course of the University of Oxford
/
2010
/
E
/
E2
/
a
/
ii
/
Solution
by
Codex
0
2026-10-31
The
map
f
:
X
→
Y
is continuous if
U
open in
Y
⟹
f
−
1
(
U
)
open in
X
.
(1)
This condition concerns inverse
images
of
open sets
;
images
of
open sets
need not be open.
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articles
:
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