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| Mirrors > Home > MPE Home > Th. List > bastop2 | Structured version Visualization version GIF version | ||
| Description: A version of bastop1 22906 that doesn't have 𝐵 ⊆ 𝐽 in the antecedent. (Contributed by NM, 3-Feb-2008.) |
| Ref | Expression |
|---|---|
| bastop2 | ⊢ (𝐽 ∈ Top → ((topGen‘𝐵) = 𝐽 ↔ (𝐵 ⊆ 𝐽 ∧ ∀𝑥 ∈ 𝐽 ∃𝑦(𝑦 ⊆ 𝐵 ∧ 𝑥 = ∪ 𝑦)))) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | eleq1 2819 | . . . . . . . 8 ⊢ ((topGen‘𝐵) = 𝐽 → ((topGen‘𝐵) ∈ Top ↔ 𝐽 ∈ Top)) | |
| 2 | 1 | biimparc 479 | . . . . . . 7 ⊢ ((𝐽 ∈ Top ∧ (topGen‘𝐵) = 𝐽) → (topGen‘𝐵) ∈ Top) |
| 3 | tgclb 22883 | . . . . . . 7 ⊢ (𝐵 ∈ TopBases ↔ (topGen‘𝐵) ∈ Top) | |
| 4 | 2, 3 | sylibr 234 | . . . . . 6 ⊢ ((𝐽 ∈ Top ∧ (topGen‘𝐵) = 𝐽) → 𝐵 ∈ TopBases) |
| 5 | bastg 22879 | . . . . . 6 ⊢ (𝐵 ∈ TopBases → 𝐵 ⊆ (topGen‘𝐵)) | |
| 6 | 4, 5 | syl 17 | . . . . 5 ⊢ ((𝐽 ∈ Top ∧ (topGen‘𝐵) = 𝐽) → 𝐵 ⊆ (topGen‘𝐵)) |
| 7 | simpr 484 | . . . . 5 ⊢ ((𝐽 ∈ Top ∧ (topGen‘𝐵) = 𝐽) → (topGen‘𝐵) = 𝐽) | |
| 8 | 6, 7 | sseqtrd 3971 | . . . 4 ⊢ ((𝐽 ∈ Top ∧ (topGen‘𝐵) = 𝐽) → 𝐵 ⊆ 𝐽) |
| 9 | 8 | ex 412 | . . 3 ⊢ (𝐽 ∈ Top → ((topGen‘𝐵) = 𝐽 → 𝐵 ⊆ 𝐽)) |
| 10 | 9 | pm4.71rd 562 | . 2 ⊢ (𝐽 ∈ Top → ((topGen‘𝐵) = 𝐽 ↔ (𝐵 ⊆ 𝐽 ∧ (topGen‘𝐵) = 𝐽))) |
| 11 | bastop1 22906 | . . 3 ⊢ ((𝐽 ∈ Top ∧ 𝐵 ⊆ 𝐽) → ((topGen‘𝐵) = 𝐽 ↔ ∀𝑥 ∈ 𝐽 ∃𝑦(𝑦 ⊆ 𝐵 ∧ 𝑥 = ∪ 𝑦))) | |
| 12 | 11 | pm5.32da 579 | . 2 ⊢ (𝐽 ∈ Top → ((𝐵 ⊆ 𝐽 ∧ (topGen‘𝐵) = 𝐽) ↔ (𝐵 ⊆ 𝐽 ∧ ∀𝑥 ∈ 𝐽 ∃𝑦(𝑦 ⊆ 𝐵 ∧ 𝑥 = ∪ 𝑦)))) |
| 13 | 10, 12 | bitrd 279 | 1 ⊢ (𝐽 ∈ Top → ((topGen‘𝐵) = 𝐽 ↔ (𝐵 ⊆ 𝐽 ∧ ∀𝑥 ∈ 𝐽 ∃𝑦(𝑦 ⊆ 𝐵 ∧ 𝑥 = ∪ 𝑦)))) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 ↔ wb 206 ∧ wa 395 = wceq 1541 ∃wex 1780 ∈ wcel 2111 ∀wral 3047 ⊆ wss 3902 ∪ cuni 4859 ‘cfv 6481 topGenctg 17338 Topctop 22806 TopBasesctb 22858 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1796 ax-4 1810 ax-5 1911 ax-6 1968 ax-7 2009 ax-8 2113 ax-9 2121 ax-10 2144 ax-11 2160 ax-12 2180 ax-ext 2703 ax-sep 5234 ax-nul 5244 ax-pow 5303 ax-pr 5370 ax-un 7668 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-or 848 df-3an 1088 df-tru 1544 df-fal 1554 df-ex 1781 df-nf 1785 df-sb 2068 df-mo 2535 df-eu 2564 df-clab 2710 df-cleq 2723 df-clel 2806 df-nfc 2881 df-ne 2929 df-ral 3048 df-rex 3057 df-rab 3396 df-v 3438 df-dif 3905 df-un 3907 df-in 3909 df-ss 3919 df-nul 4284 df-if 4476 df-pw 4552 df-sn 4577 df-pr 4579 df-op 4583 df-uni 4860 df-br 5092 df-opab 5154 df-mpt 5173 df-id 5511 df-xp 5622 df-rel 5623 df-cnv 5624 df-co 5625 df-dm 5626 df-iota 6437 df-fun 6483 df-fv 6489 df-topgen 17344 df-top 22807 df-bases 22859 |
| This theorem is referenced by: (None) |
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