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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 15163 | . 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 15147 TopOnctopon 15160 |
| 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 15161 |
| This theorem is used by: topontopi 15166 topontopon 15170 toponmax 15175 topgele 15179 istps 15182 topontopn 15187 resttopon 15321 resttopon2 15328 lmfval 15343 cnfval 15344 cnpfval 15345 cnprcl2k 15356 cnpf2 15357 tgcn 15358 tgcnp 15359 iscnp4 15368 cnntr 15375 cncnp 15380 cnptopresti 15388 txtopon 15412 txcnp 15421 txlm 15429 cnmpt2res 15447 mopntop 15594 metcnpi 15665 metcnpi3 15667 dvfvalap 15831 dvfgg 15838 dvaddxxbr 15851 dvmulxxbr 15852 |
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