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| Mirrors > Home > ILE Home > Th. List > 2basgeng | GIF version | ||
| Description: Conditions that determine the equality of two generated topologies. (Contributed by NM, 8-May-2007.) (Revised by Jim Kingdon, 5-Mar-2023.) |
| Ref | Expression |
|---|---|
| 2basgeng | ⊢ ((𝐵 ∈ 𝑉 ∧ 𝐵 ⊆ 𝐶 ∧ 𝐶 ⊆ (topGen‘𝐵)) → (topGen‘𝐵) = (topGen‘𝐶)) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | tgvalex 13139 | . . . . 5 ⊢ (𝐵 ∈ 𝑉 → (topGen‘𝐵) ∈ V) | |
| 2 | 1 | 3ad2ant1 1021 | . . . 4 ⊢ ((𝐵 ∈ 𝑉 ∧ 𝐵 ⊆ 𝐶 ∧ 𝐶 ⊆ (topGen‘𝐵)) → (topGen‘𝐵) ∈ V) |
| 3 | simp3 1002 | . . . 4 ⊢ ((𝐵 ∈ 𝑉 ∧ 𝐵 ⊆ 𝐶 ∧ 𝐶 ⊆ (topGen‘𝐵)) → 𝐶 ⊆ (topGen‘𝐵)) | |
| 4 | 2, 3 | ssexd 4188 | . . 3 ⊢ ((𝐵 ∈ 𝑉 ∧ 𝐵 ⊆ 𝐶 ∧ 𝐶 ⊆ (topGen‘𝐵)) → 𝐶 ∈ V) |
| 5 | simp2 1001 | . . 3 ⊢ ((𝐵 ∈ 𝑉 ∧ 𝐵 ⊆ 𝐶 ∧ 𝐶 ⊆ (topGen‘𝐵)) → 𝐵 ⊆ 𝐶) | |
| 6 | tgss 14579 | . . 3 ⊢ ((𝐶 ∈ V ∧ 𝐵 ⊆ 𝐶) → (topGen‘𝐵) ⊆ (topGen‘𝐶)) | |
| 7 | 4, 5, 6 | syl2anc 411 | . 2 ⊢ ((𝐵 ∈ 𝑉 ∧ 𝐵 ⊆ 𝐶 ∧ 𝐶 ⊆ (topGen‘𝐵)) → (topGen‘𝐵) ⊆ (topGen‘𝐶)) |
| 8 | simp1 1000 | . . . 4 ⊢ ((𝐵 ∈ 𝑉 ∧ 𝐵 ⊆ 𝐶 ∧ 𝐶 ⊆ (topGen‘𝐵)) → 𝐵 ∈ 𝑉) | |
| 9 | tgss3 14594 | . . . 4 ⊢ ((𝐶 ∈ V ∧ 𝐵 ∈ 𝑉) → ((topGen‘𝐶) ⊆ (topGen‘𝐵) ↔ 𝐶 ⊆ (topGen‘𝐵))) | |
| 10 | 4, 8, 9 | syl2anc 411 | . . 3 ⊢ ((𝐵 ∈ 𝑉 ∧ 𝐵 ⊆ 𝐶 ∧ 𝐶 ⊆ (topGen‘𝐵)) → ((topGen‘𝐶) ⊆ (topGen‘𝐵) ↔ 𝐶 ⊆ (topGen‘𝐵))) |
| 11 | 3, 10 | mpbird 167 | . 2 ⊢ ((𝐵 ∈ 𝑉 ∧ 𝐵 ⊆ 𝐶 ∧ 𝐶 ⊆ (topGen‘𝐵)) → (topGen‘𝐶) ⊆ (topGen‘𝐵)) |
| 12 | 7, 11 | eqssd 3211 | 1 ⊢ ((𝐵 ∈ 𝑉 ∧ 𝐵 ⊆ 𝐶 ∧ 𝐶 ⊆ (topGen‘𝐵)) → (topGen‘𝐵) = (topGen‘𝐶)) |
| Colors of variables: wff set class |
| Syntax hints: → wi 4 ↔ wb 105 ∧ w3a 981 = wceq 1373 ∈ wcel 2177 Vcvv 2773 ⊆ wss 3167 ‘cfv 5276 topGenctg 13130 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 106 ax-ia2 107 ax-ia3 108 ax-io 711 ax-5 1471 ax-7 1472 ax-gen 1473 ax-ie1 1517 ax-ie2 1518 ax-8 1528 ax-10 1529 ax-11 1530 ax-i12 1531 ax-bndl 1533 ax-4 1534 ax-17 1550 ax-i9 1554 ax-ial 1558 ax-i5r 1559 ax-13 2179 ax-14 2180 ax-ext 2188 ax-sep 4166 ax-pow 4222 ax-pr 4257 ax-un 4484 |
| This theorem depends on definitions: df-bi 117 df-3an 983 df-tru 1376 df-nf 1485 df-sb 1787 df-eu 2058 df-mo 2059 df-clab 2193 df-cleq 2199 df-clel 2202 df-nfc 2338 df-ral 2490 df-rex 2491 df-v 2775 df-sbc 3000 df-un 3171 df-in 3173 df-ss 3180 df-pw 3619 df-sn 3640 df-pr 3641 df-op 3643 df-uni 3853 df-iun 3931 df-br 4048 df-opab 4110 df-mpt 4111 df-id 4344 df-xp 4685 df-rel 4686 df-cnv 4687 df-co 4688 df-dm 4689 df-iota 5237 df-fun 5278 df-fv 5284 df-topgen 13136 |
| This theorem is referenced by: txbasval 14783 tgioo 15070 tgqioo 15071 |
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