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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 3412 |
. . . . 5
| |
| 2 | elpwg 3696 |
. . . . . 6
| |
| 3 | 2 | pm5.32i 458 |
. . . . 5
|
| 4 | 1, 3 | bitr2i 185 |
. . . 4
|
| 5 | elssuni 3963 |
. . . 4
| |
| 6 | 4, 5 | sylbi 121 |
. . 3
|
| 7 | 6 | adantl 277 |
. 2
|
| 8 | clscld.1 |
. . . 4
| |
| 9 | 8 | ntrval 15211 |
. . 3
|
| 10 | 9 | adantr 276 |
. 2
|
| 11 | 7, 10 | sseqtrrd 3287 |
1
|
| Colors of variables: wff set class |
| This proof depends on syntax axioms:
|
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 106 ax-ia2 107 ax-ia3 108 ax-io 721 ax-5 1500 ax-7 1501 ax-gen 1502 ax-ie1 1546 ax-ie2 1547 ax-8 1557 ax-10 1558 ax-11 1559 ax-i12 1560 ax-bndl 1562 ax-4 1563 ax-17 1579 ax-i9 1583 ax-ial 1587 ax-i5r 1588 ax-14 2212 ax-ext 2220 ax-coll 4246 ax-sep 4249 ax-pow 4311 ax-pr 4346 ax-un 4578 |
| This proof depends on definitions: df-bi 117 df-3an 1011 df-tru 1405 df-nf 1514 df-sb 1816 df-eu 2089 df-mo 2090 df-clab 2225 df-cleq 2231 df-clel 2234 df-nfc 2381 df-ral 2533 df-rex 2534 df-reu 2535 df-rab 2537 df-v 2823 df-sbc 3052 df-csb 3148 df-un 3224 df-in 3226 df-ss 3233 df-pw 3690 df-sn 3715 df-pr 3716 df-op 3718 df-uni 3936 df-iun 4014 df-br 4131 df-opab 4193 df-mpt 4194 df-id 4438 df-xp 4780 df-rel 4781 df-cnv 4782 df-co 4783 df-dm 4784 df-rn 4785 df-res 4786 df-ima 4787 df-iota 5337 df-fun 5379 df-fn 5380 df-f 5381 df-f1 5382 df-fo 5383 df-f1o 5384 df-fv 5385 df-top 15099 df-ntr 15197 |
| This theorem is used by: ntrin 15225 neiint 15246 cnntri 15325 |
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