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Mirrors > Home > MPE Home > Th. List > ist1-2 | Structured version Visualization version Unicode version |
Description: An alternate characterization of T1 spaces. (Contributed by Jeff Hankins, 31-Jan-2010.) (Proof shortened by Mario Carneiro, 24-Aug-2015.) |
Ref | Expression |
---|---|
ist1-2 | TopOn |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | topontop 20718 | . . 3 TopOn | |
2 | eqid 2622 | . . . . 5 | |
3 | 2 | ist1 21125 | . . . 4 |
4 | 3 | baib 944 | . . 3 |
5 | 1, 4 | syl 17 | . 2 TopOn |
6 | toponuni 20719 | . . 3 TopOn | |
7 | 6 | raleqdv 3144 | . 2 TopOn |
8 | 1 | adantr 481 | . . . . . 6 TopOn |
9 | eltop2 20779 | . . . . . 6 | |
10 | 8, 9 | syl 17 | . . . . 5 TopOn |
11 | 6 | eleq2d 2687 | . . . . . . . 8 TopOn |
12 | 11 | biimpa 501 | . . . . . . 7 TopOn |
13 | 12 | snssd 4340 | . . . . . 6 TopOn |
14 | 2 | iscld2 20832 | . . . . . 6 |
15 | 8, 13, 14 | syl2anc 693 | . . . . 5 TopOn |
16 | 6 | adantr 481 | . . . . . . . . 9 TopOn |
17 | 16 | eleq2d 2687 | . . . . . . . 8 TopOn |
18 | 17 | imbi1d 331 | . . . . . . 7 TopOn |
19 | con1b 348 | . . . . . . . . 9 | |
20 | df-ne 2795 | . . . . . . . . . 10 | |
21 | 20 | imbi1i 339 | . . . . . . . . 9 |
22 | disjsn 4246 | . . . . . . . . . . . . . . 15 | |
23 | elssuni 4467 | . . . . . . . . . . . . . . . 16 | |
24 | reldisj 4020 | . . . . . . . . . . . . . . . 16 | |
25 | 23, 24 | syl 17 | . . . . . . . . . . . . . . 15 |
26 | 22, 25 | syl5bbr 274 | . . . . . . . . . . . . . 14 |
27 | 26 | anbi2d 740 | . . . . . . . . . . . . 13 |
28 | 27 | rexbiia 3040 | . . . . . . . . . . . 12 |
29 | rexanali 2998 | . . . . . . . . . . . 12 | |
30 | 28, 29 | bitr3i 266 | . . . . . . . . . . 11 |
31 | 30 | con2bii 347 | . . . . . . . . . 10 |
32 | 31 | imbi1i 339 | . . . . . . . . 9 |
33 | 19, 21, 32 | 3bitr4ri 293 | . . . . . . . 8 |
34 | 33 | imbi2i 326 | . . . . . . 7 |
35 | eldifsn 4317 | . . . . . . . . 9 | |
36 | 35 | imbi1i 339 | . . . . . . . 8 |
37 | impexp 462 | . . . . . . . 8 | |
38 | 36, 37 | bitri 264 | . . . . . . 7 |
39 | 18, 34, 38 | 3bitr4g 303 | . . . . . 6 TopOn |
40 | 39 | ralbidv2 2984 | . . . . 5 TopOn |
41 | 10, 15, 40 | 3bitr4d 300 | . . . 4 TopOn |
42 | 41 | ralbidva 2985 | . . 3 TopOn |
43 | ralcom 3098 | . . 3 | |
44 | 42, 43 | syl6bb 276 | . 2 TopOn |
45 | 5, 7, 44 | 3bitr2d 296 | 1 TopOn |
Colors of variables: wff setvar class |
Syntax hints: wn 3 wi 4 wb 196 wa 384 wceq 1483 wcel 1990 wne 2794 wral 2912 wrex 2913 cdif 3571 cin 3573 wss 3574 c0 3915 csn 4177 cuni 4436 cfv 5888 ctop 20698 TopOnctopon 20715 ccld 20820 ct1 21111 |
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-topon 20716 df-cld 20823 df-t1 21118 |
This theorem is referenced by: t1t0 21152 ist1-3 21153 haust1 21156 t1sep2 21173 isr0 21540 tgpt0 21922 |
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