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Mirrors > Home > ILE Home > Th. List > ssntr | Unicode version |
Description: An open subset of a set is a subset of the set's interior. (Contributed by Jeff Hankins, 31-Aug-2009.) (Revised by Mario Carneiro, 11-Nov-2013.) |
Ref | Expression |
---|---|
clscld.1 |
Ref | Expression |
---|---|
ssntr |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | elin 3316 | . . . . 5 | |
2 | elpwg 3580 | . . . . . 6 | |
3 | 2 | pm5.32i 454 | . . . . 5 |
4 | 1, 3 | bitr2i 185 | . . . 4 |
5 | elssuni 3833 | . . . 4 | |
6 | 4, 5 | sylbi 121 | . . 3 |
7 | 6 | adantl 277 | . 2 |
8 | clscld.1 | . . . 4 | |
9 | 8 | ntrval 13179 | . . 3 |
10 | 9 | adantr 276 | . 2 |
11 | 7, 10 | sseqtrrd 3192 | 1 |
Colors of variables: wff set class |
Syntax hints: wi 4 wa 104 wceq 1353 wcel 2146 cin 3126 wss 3127 cpw 3572 cuni 3805 cfv 5208 ctop 13064 cnt 13162 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 106 ax-ia2 107 ax-ia3 108 ax-io 709 ax-5 1445 ax-7 1446 ax-gen 1447 ax-ie1 1491 ax-ie2 1492 ax-8 1502 ax-10 1503 ax-11 1504 ax-i12 1505 ax-bndl 1507 ax-4 1508 ax-17 1524 ax-i9 1528 ax-ial 1532 ax-i5r 1533 ax-13 2148 ax-14 2149 ax-ext 2157 ax-coll 4113 ax-sep 4116 ax-pow 4169 ax-pr 4203 ax-un 4427 |
This theorem depends on definitions: df-bi 117 df-3an 980 df-tru 1356 df-nf 1459 df-sb 1761 df-eu 2027 df-mo 2028 df-clab 2162 df-cleq 2168 df-clel 2171 df-nfc 2306 df-ral 2458 df-rex 2459 df-reu 2460 df-rab 2462 df-v 2737 df-sbc 2961 df-csb 3056 df-un 3131 df-in 3133 df-ss 3140 df-pw 3574 df-sn 3595 df-pr 3596 df-op 3598 df-uni 3806 df-iun 3884 df-br 3999 df-opab 4060 df-mpt 4061 df-id 4287 df-xp 4626 df-rel 4627 df-cnv 4628 df-co 4629 df-dm 4630 df-rn 4631 df-res 4632 df-ima 4633 df-iota 5170 df-fun 5210 df-fn 5211 df-f 5212 df-f1 5213 df-fo 5214 df-f1o 5215 df-fv 5216 df-top 13065 df-ntr 13165 |
This theorem is referenced by: ntrin 13193 neiint 13214 cnntri 13293 |
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