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| Mirrors > Home > ILE Home > Th. List > topontop | GIF version | ||
| Description: A topology on a given base set is a topology. (Contributed by Mario Carneiro, 13-Aug-2015.) |
| Ref | Expression |
|---|---|
| topontop | ⊢ (𝐽 ∈ (TopOn‘𝐵) → 𝐽 ∈ Top) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | istopon 15114 | . 2 ⊢ (𝐽 ∈ (TopOn‘𝐵) ↔ (𝐽 ∈ Top ∧ 𝐵 = ∪ 𝐽)) | |
| 2 | 1 | simplbi 274 | 1 ⊢ (𝐽 ∈ (TopOn‘𝐵) → 𝐽 ∈ Top) |
| Colors of variables: wff set class |
| This proof depends on syntax axioms: → wi 4 = wceq 1402 ∈ wcel 2209 ∪ cuni 3935 ‘cfv 5377 Topctop 15098 TopOnctopon 15111 |
| 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-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-rab 2537 df-v 2823 df-sbc 3052 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-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-iota 5337 df-fun 5379 df-fv 5385 df-topon 15112 |
| This theorem is used by: topontopi 15117 topontopon 15121 toponmax 15126 topgele 15130 istps 15133 topontopn 15138 resttopon 15272 resttopon2 15279 lmfval 15294 cnfval 15295 cnpfval 15296 cnprcl2k 15307 cnpf2 15308 tgcn 15309 tgcnp 15310 iscnp4 15319 cnntr 15326 cncnp 15331 cnptopresti 15339 txtopon 15363 txcnp 15372 txlm 15380 cnmpt2res 15398 mopntop 15545 metcnpi 15616 metcnpi3 15618 dvfvalap 15782 dvfgg 15789 dvaddxxbr 15802 dvmulxxbr 15803 |
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