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Mirrors > Home > MPE Home > Th. List > isclo | Structured version Visualization version Unicode version |
Description: A set is clopen iff for every point in the space there is a neighborhood such that all the points in are in iff is. (Contributed by Mario Carneiro, 10-Mar-2015.) |
Ref | Expression |
---|---|
isclo.1 |
Ref | Expression |
---|---|
isclo |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | elin 3796 | . 2 | |
2 | isclo.1 | . . . . 5 | |
3 | 2 | iscld2 20832 | . . . 4 |
4 | 3 | anbi2d 740 | . . 3 |
5 | eltop2 20779 | . . . . . 6 | |
6 | dfss3 3592 | . . . . . . . . . 10 | |
7 | pm5.501 356 | . . . . . . . . . . 11 | |
8 | 7 | ralbidv 2986 | . . . . . . . . . 10 |
9 | 6, 8 | syl5bb 272 | . . . . . . . . 9 |
10 | 9 | anbi2d 740 | . . . . . . . 8 |
11 | 10 | rexbidv 3052 | . . . . . . 7 |
12 | 11 | ralbiia 2979 | . . . . . 6 |
13 | 5, 12 | syl6bb 276 | . . . . 5 |
14 | eltop2 20779 | . . . . . 6 | |
15 | dfss3 3592 | . . . . . . . . . 10 | |
16 | id 22 | . . . . . . . . . . . . . . 15 | |
17 | simpr 477 | . . . . . . . . . . . . . . 15 | |
18 | elunii 4441 | . . . . . . . . . . . . . . 15 | |
19 | 16, 17, 18 | syl2anr 495 | . . . . . . . . . . . . . 14 |
20 | 19, 2 | syl6eleqr 2712 | . . . . . . . . . . . . 13 |
21 | eldif 3584 | . . . . . . . . . . . . . 14 | |
22 | 21 | baib 944 | . . . . . . . . . . . . 13 |
23 | 20, 22 | syl 17 | . . . . . . . . . . . 12 |
24 | eldifn 3733 | . . . . . . . . . . . . . 14 | |
25 | nbn2 360 | . . . . . . . . . . . . . 14 | |
26 | 24, 25 | syl 17 | . . . . . . . . . . . . 13 |
27 | 26 | ad2antrr 762 | . . . . . . . . . . . 12 |
28 | 23, 27 | bitrd 268 | . . . . . . . . . . 11 |
29 | 28 | ralbidva 2985 | . . . . . . . . . 10 |
30 | 15, 29 | syl5bb 272 | . . . . . . . . 9 |
31 | 30 | anbi2d 740 | . . . . . . . 8 |
32 | 31 | rexbidva 3049 | . . . . . . 7 |
33 | 32 | ralbiia 2979 | . . . . . 6 |
34 | 14, 33 | syl6bb 276 | . . . . 5 |
35 | 13, 34 | anbi12d 747 | . . . 4 |
36 | 35 | adantr 481 | . . 3 |
37 | ralunb 3794 | . . . 4 | |
38 | simpr 477 | . . . . . 6 | |
39 | undif 4049 | . . . . . 6 | |
40 | 38, 39 | sylib 208 | . . . . 5 |
41 | 40 | raleqdv 3144 | . . . 4 |
42 | 37, 41 | syl5bbr 274 | . . 3 |
43 | 4, 36, 42 | 3bitrd 294 | . 2 |
44 | 1, 43 | syl5bb 272 | 1 |
Colors of variables: wff setvar class |
Syntax hints: wn 3 wi 4 wb 196 wa 384 wceq 1483 wcel 1990 wral 2912 wrex 2913 cdif 3571 cun 3572 cin 3573 wss 3574 cuni 4436 cfv 5888 ctop 20698 ccld 20820 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1722 ax-4 1737 ax-5 1839 ax-6 1888 ax-7 1935 ax-8 1992 ax-9 1999 ax-10 2019 ax-11 2034 ax-12 2047 ax-13 2246 ax-ext 2602 ax-sep 4781 ax-nul 4789 ax-pow 4843 ax-pr 4906 ax-un 6949 |
This theorem depends on definitions: df-bi 197 df-or 385 df-an 386 df-3an 1039 df-tru 1486 df-ex 1705 df-nf 1710 df-sb 1881 df-eu 2474 df-mo 2475 df-clab 2609 df-cleq 2615 df-clel 2618 df-nfc 2753 df-ne 2795 df-ral 2917 df-rex 2918 df-rab 2921 df-v 3202 df-sbc 3436 df-dif 3577 df-un 3579 df-in 3581 df-ss 3588 df-nul 3916 df-if 4087 df-pw 4160 df-sn 4178 df-pr 4180 df-op 4184 df-uni 4437 df-br 4654 df-opab 4713 df-mpt 4730 df-id 5024 df-xp 5120 df-rel 5121 df-cnv 5122 df-co 5123 df-dm 5124 df-iota 5851 df-fun 5890 df-fv 5896 df-topgen 16104 df-top 20699 df-cld 20823 |
This theorem is referenced by: isclo2 20892 cvmliftmolem2 31264 cvmlift2lem12 31296 |
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