Description: If F is a surjective continuous closed map, then it is a quotient map. (A closed map is a function that maps closed sets to closed sets.) (Contributed by Mario Carneiro, 24-Mar-2015)
Ref | Expression | ||
---|---|---|---|
Hypotheses | qtopomap.4 | |
|
qtopomap.5 | |
||
qtopomap.6 | |
||
qtopcmap.7 | |
||
Assertion | qtopcmap | |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | qtopomap.4 | |
|
2 | qtopomap.5 | |
|
3 | qtopomap.6 | |
|
4 | qtopcmap.7 | |
|
5 | qtopss | |
|
6 | 2 1 3 5 | syl3anc | |
7 | cntop1 | |
|
8 | 2 7 | syl | |
9 | toptopon2 | |
|
10 | 8 9 | sylib | |
11 | cnf2 | |
|
12 | 10 1 2 11 | syl3anc | |
13 | 12 | ffnd | |
14 | df-fo | |
|
15 | 13 3 14 | sylanbrc | |
16 | eqid | |
|
17 | 16 | elqtop2 | |
18 | 8 15 17 | syl2anc | |
19 | 15 | adantr | |
20 | difss | |
|
21 | foimacnv | |
|
22 | 19 20 21 | sylancl | |
23 | 1 | adantr | |
24 | toponuni | |
|
25 | 23 24 | syl | |
26 | 25 | difeq1d | |
27 | 22 26 | eqtrd | |
28 | imaeq2 | |
|
29 | 28 | eleq1d | |
30 | 4 | ralrimiva | |
31 | 30 | adantr | |
32 | fofun | |
|
33 | funcnvcnv | |
|
34 | imadif | |
|
35 | 19 32 33 34 | 4syl | |
36 | 12 | adantr | |
37 | fimacnv | |
|
38 | 36 37 | syl | |
39 | 38 | difeq1d | |
40 | 35 39 | eqtrd | |
41 | 8 | adantr | |
42 | simprr | |
|
43 | 16 | opncld | |
44 | 41 42 43 | syl2anc | |
45 | 40 44 | eqeltrd | |
46 | 29 31 45 | rspcdva | |
47 | 27 46 | eqeltrrd | |
48 | topontop | |
|
49 | 23 48 | syl | |
50 | simprl | |
|
51 | 50 25 | sseqtrd | |
52 | eqid | |
|
53 | 52 | isopn2 | |
54 | 49 51 53 | syl2anc | |
55 | 47 54 | mpbird | |
56 | 55 | ex | |
57 | 18 56 | sylbid | |
58 | 57 | ssrdv | |
59 | 6 58 | eqssd | |