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| Mirrors > Home > MPE Home > Th. List > bastop2 | Structured version Visualization version GIF version | ||
| Description: A version of bastop1 23224 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 2850 | . . . . . . . 8 ⊢ ((topGen‘𝐵) = 𝐽 → ((topGen‘𝐵) ∈ Top ↔ 𝐽 ∈ Top)) | |
| 2 | 1 | biimparc 485 | . . . . . . 7 ⊢ ((𝐽 ∈ Top ∧ (topGen‘𝐵) = 𝐽) → (topGen‘𝐵) ∈ Top) |
| 3 | tgclb 23201 | . . . . . . 7 ⊢ (𝐵 ∈ TopBases ↔ (topGen‘𝐵) ∈ Top) | |
| 4 | 2, 3 | sylibr 237 | . . . . . 6 ⊢ ((𝐽 ∈ Top ∧ (topGen‘𝐵) = 𝐽) → 𝐵 ∈ TopBases) |
| 5 | bastg 23197 | . . . . . 6 ⊢ (𝐵 ∈ TopBases → 𝐵 ⊆ (topGen‘𝐵)) | |
| 6 | 4, 5 | syl 18 | . . . . 5 ⊢ ((𝐽 ∈ Top ∧ (topGen‘𝐵) = 𝐽) → 𝐵 ⊆ (topGen‘𝐵)) |
| 7 | simpr 490 | . . . . 5 ⊢ ((𝐽 ∈ Top ∧ (topGen‘𝐵) = 𝐽) → (topGen‘𝐵) = 𝐽) | |
| 8 | 6, 7 | sseqtrd 3970 | . . . 4 ⊢ ((𝐽 ∈ Top ∧ (topGen‘𝐵) = 𝐽) → 𝐵 ⊆ 𝐽) |
| 9 | 8 | ex 418 | . . 3 ⊢ (𝐽 ∈ Top → ((topGen‘𝐵) = 𝐽 → 𝐵 ⊆ 𝐽)) |
| 10 | 9 | pm4.71rd 572 | . 2 ⊢ (𝐽 ∈ Top → ((topGen‘𝐵) = 𝐽 ↔ (𝐵 ⊆ 𝐽 ∧ (topGen‘𝐵) = 𝐽))) |
| 11 | bastop1 23224 | . . 3 ⊢ ((𝐽 ∈ Top ∧ 𝐵 ⊆ 𝐽) → ((topGen‘𝐵) = 𝐽 ↔ ∀𝑥 ∈ 𝐽 ∃𝑦(𝑦 ⊆ 𝐵 ∧ 𝑥 = ∪ 𝑦))) | |
| 12 | 11 | pm5.32da 590 | . 2 ⊢ (𝐽 ∈ Top → ((𝐵 ⊆ 𝐽 ∧ (topGen‘𝐵) = 𝐽) ↔ (𝐵 ⊆ 𝐽 ∧ ∀𝑥 ∈ 𝐽 ∃𝑦(𝑦 ⊆ 𝐵 ∧ 𝑥 = ∪ 𝑦)))) |
| 13 | 10, 12 | bitrd 282 | 1 ⊢ (𝐽 ∈ Top → ((topGen‘𝐵) = 𝐽 ↔ (𝐵 ⊆ 𝐽 ∧ ∀𝑥 ∈ 𝐽 ∃𝑦(𝑦 ⊆ 𝐵 ∧ 𝑥 = ∪ 𝑦)))) |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: → wi 4 ↔ wb 209 ∧ wa 401 = wceq 1570 ∃wex 1812 ∈ wcel 2145 ∀wral 3078 ⊆ wss 3902 ∪ cuni 4870 ‘cfv 6537 topGenctg 17528 Topctop 23124 TopBasesctb 23176 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1828 ax-4 1842 ax-5 1943 ax-6 2000 ax-7 2041 ax-8 2147 ax-9 2155 ax-10 2178 ax-11 2194 ax-12 2215 ax-ext 2734 ax-sep 5255 ax-nul 5267 ax-pow 5334 ax-pr 5402 ax-un 7740 |
| This proof depends on definitions: df-bi 210 df-an 402 df-or 862 df-3an 1105 df-tru 1573 df-fal 1583 df-ex 1813 df-nf 1817 df-sb 2100 df-mo 2566 df-eu 2596 df-clab 2741 df-cleq 2754 df-clel 2837 df-nfc 2911 df-ne 2958 df-ral 3079 df-rex 3089 df-rab 3415 df-v 3455 df-dif 3905 df-un 3907 df-in 3909 df-ss 3919 df-nul 4283 df-if 4486 df-pw 4562 df-sn 4588 df-pr 4590 df-op 4594 df-uni 4871 df-br 5108 df-opab 5172 df-mpt 5191 df-id 5554 df-xp 5665 df-rel 5666 df-cnv 5667 df-co 5668 df-dm 5669 df-iota 6493 df-fun 6539 df-fv 6545 df-topgen 17534 df-top 23125 df-bases 23177 |
| This theorem is used by: (None) |
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