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Mirrors > Home > MPE Home > Th. List > regsep2 | Structured version Visualization version Unicode version |
Description: In a regular space, a closed set is separated by open sets from a point not in it. (Contributed by Jeff Hankins, 1-Feb-2010.) (Revised by Mario Carneiro, 25-Aug-2015.) |
Ref | Expression |
---|---|
t1sep.1 |
Ref | Expression |
---|---|
regsep2 |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | regtop 21137 | . . . . . . 7 | |
2 | 1 | ad2antrr 762 | . . . . . 6 |
3 | elssuni 4467 | . . . . . . . 8 | |
4 | t1sep.1 | . . . . . . . 8 | |
5 | 3, 4 | syl6sseqr 3652 | . . . . . . 7 |
6 | 5 | ad2antrl 764 | . . . . . 6 |
7 | 4 | clscld 20851 | . . . . . 6 |
8 | 2, 6, 7 | syl2anc 693 | . . . . 5 |
9 | 4 | cldopn 20835 | . . . . 5 |
10 | 8, 9 | syl 17 | . . . 4 |
11 | simprrr 805 | . . . . 5 | |
12 | 4 | clsss3 20863 | . . . . . . 7 |
13 | 2, 6, 12 | syl2anc 693 | . . . . . 6 |
14 | simplr1 1103 | . . . . . . 7 | |
15 | 4 | cldss 20833 | . . . . . . 7 |
16 | 14, 15 | syl 17 | . . . . . 6 |
17 | ssconb 3743 | . . . . . 6 | |
18 | 13, 16, 17 | syl2anc 693 | . . . . 5 |
19 | 11, 18 | mpbid 222 | . . . 4 |
20 | simprrl 804 | . . . 4 | |
21 | 4 | sscls 20860 | . . . . . . 7 |
22 | 2, 6, 21 | syl2anc 693 | . . . . . 6 |
23 | sslin 3839 | . . . . . 6 | |
24 | 22, 23 | syl 17 | . . . . 5 |
25 | incom 3805 | . . . . . 6 | |
26 | disjdif 4040 | . . . . . 6 | |
27 | 25, 26 | eqtri 2644 | . . . . 5 |
28 | sseq0 3975 | . . . . 5 | |
29 | 24, 27, 28 | sylancl 694 | . . . 4 |
30 | sseq2 3627 | . . . . . 6 | |
31 | ineq1 3807 | . . . . . . 7 | |
32 | 31 | eqeq1d 2624 | . . . . . 6 |
33 | 30, 32 | 3anbi13d 1401 | . . . . 5 |
34 | 33 | rspcev 3309 | . . . 4 |
35 | 10, 19, 20, 29, 34 | syl13anc 1328 | . . 3 |
36 | simpl 473 | . . . 4 | |
37 | simpr1 1067 | . . . . 5 | |
38 | 4 | cldopn 20835 | . . . . 5 |
39 | 37, 38 | syl 17 | . . . 4 |
40 | simpr2 1068 | . . . . 5 | |
41 | simpr3 1069 | . . . . 5 | |
42 | 40, 41 | eldifd 3585 | . . . 4 |
43 | regsep 21138 | . . . 4 | |
44 | 36, 39, 42, 43 | syl3anc 1326 | . . 3 |
45 | 35, 44 | reximddv 3018 | . 2 |
46 | rexcom 3099 | . 2 | |
47 | 45, 46 | sylib 208 | 1 |
Colors of variables: wff setvar class |
Syntax hints: wn 3 wi 4 wb 196 wa 384 w3a 1037 wceq 1483 wcel 1990 wrex 2913 cdif 3571 cin 3573 wss 3574 c0 3915 cuni 4436 cfv 5888 ctop 20698 ccld 20820 ccl 20822 creg 21113 |
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-rep 4771 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-reu 2919 df-rab 2921 df-v 3202 df-sbc 3436 df-csb 3534 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-int 4476 df-iun 4522 df-iin 4523 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-rn 5125 df-res 5126 df-ima 5127 df-iota 5851 df-fun 5890 df-fn 5891 df-f 5892 df-f1 5893 df-fo 5894 df-f1o 5895 df-fv 5896 df-top 20699 df-cld 20823 df-cls 20825 df-reg 21120 |
This theorem is referenced by: isreg2 21181 |
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