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Mirrors > Home > MPE Home > Th. List > 2basgen | Structured version Visualization version GIF version |
Description: Conditions that determine the equality of two generated topologies. (Contributed by NM, 8-May-2007.) (Revised by Mario Carneiro, 2-Sep-2015.) |
Ref | Expression |
---|---|
2basgen | ⊢ ((𝐵 ⊆ 𝐶 ∧ 𝐶 ⊆ (topGen‘𝐵)) → (topGen‘𝐵) = (topGen‘𝐶)) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | fvex 6727 | . . . 4 ⊢ (topGen‘𝐵) ∈ V | |
2 | 1 | ssex 5211 | . . 3 ⊢ (𝐶 ⊆ (topGen‘𝐵) → 𝐶 ∈ V) |
3 | simpl 486 | . . 3 ⊢ ((𝐵 ⊆ 𝐶 ∧ 𝐶 ⊆ (topGen‘𝐵)) → 𝐵 ⊆ 𝐶) | |
4 | tgss 21862 | . . 3 ⊢ ((𝐶 ∈ V ∧ 𝐵 ⊆ 𝐶) → (topGen‘𝐵) ⊆ (topGen‘𝐶)) | |
5 | 2, 3, 4 | syl2an2 686 | . 2 ⊢ ((𝐵 ⊆ 𝐶 ∧ 𝐶 ⊆ (topGen‘𝐵)) → (topGen‘𝐵) ⊆ (topGen‘𝐶)) |
6 | simpr 488 | . . 3 ⊢ ((𝐵 ⊆ 𝐶 ∧ 𝐶 ⊆ (topGen‘𝐵)) → 𝐶 ⊆ (topGen‘𝐵)) | |
7 | ssexg 5213 | . . . . 5 ⊢ ((𝐵 ⊆ 𝐶 ∧ 𝐶 ∈ V) → 𝐵 ∈ V) | |
8 | 2, 7 | sylan2 596 | . . . 4 ⊢ ((𝐵 ⊆ 𝐶 ∧ 𝐶 ⊆ (topGen‘𝐵)) → 𝐵 ∈ V) |
9 | tgss3 21880 | . . . 4 ⊢ ((𝐶 ∈ V ∧ 𝐵 ∈ V) → ((topGen‘𝐶) ⊆ (topGen‘𝐵) ↔ 𝐶 ⊆ (topGen‘𝐵))) | |
10 | 2, 8, 9 | syl2an2 686 | . . 3 ⊢ ((𝐵 ⊆ 𝐶 ∧ 𝐶 ⊆ (topGen‘𝐵)) → ((topGen‘𝐶) ⊆ (topGen‘𝐵) ↔ 𝐶 ⊆ (topGen‘𝐵))) |
11 | 6, 10 | mpbird 260 | . 2 ⊢ ((𝐵 ⊆ 𝐶 ∧ 𝐶 ⊆ (topGen‘𝐵)) → (topGen‘𝐶) ⊆ (topGen‘𝐵)) |
12 | 5, 11 | eqssd 3915 | 1 ⊢ ((𝐵 ⊆ 𝐶 ∧ 𝐶 ⊆ (topGen‘𝐵)) → (topGen‘𝐵) = (topGen‘𝐶)) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ↔ wb 209 ∧ wa 399 = wceq 1543 ∈ wcel 2110 Vcvv 3405 ⊆ wss 3863 ‘cfv 6377 topGenctg 16939 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1803 ax-4 1817 ax-5 1918 ax-6 1976 ax-7 2016 ax-8 2112 ax-9 2120 ax-10 2141 ax-11 2158 ax-12 2175 ax-ext 2708 ax-sep 5189 ax-nul 5196 ax-pow 5255 ax-pr 5319 ax-un 7520 |
This theorem depends on definitions: df-bi 210 df-an 400 df-or 848 df-3an 1091 df-tru 1546 df-fal 1556 df-ex 1788 df-nf 1792 df-sb 2071 df-mo 2539 df-eu 2568 df-clab 2715 df-cleq 2729 df-clel 2816 df-nfc 2886 df-ne 2940 df-ral 3063 df-rex 3064 df-rab 3067 df-v 3407 df-dif 3866 df-un 3868 df-in 3870 df-ss 3880 df-nul 4235 df-if 4437 df-pw 4512 df-sn 4539 df-pr 4541 df-op 4545 df-uni 4817 df-iun 4903 df-br 5051 df-opab 5113 df-mpt 5133 df-id 5452 df-xp 5554 df-rel 5555 df-cnv 5556 df-co 5557 df-dm 5558 df-iota 6335 df-fun 6379 df-fv 6385 df-topgen 16945 |
This theorem is referenced by: leordtval2 22106 2ndcsb 22343 txbasval 22500 prdsxmslem2 23424 tgioo 23690 tgqioo 23694 |
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