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| Mirrors > Home > MPE Home > Th. List > eltop | Structured version Visualization version GIF version | ||
| Description: Membership in a topology, expressed without quantifiers. (Contributed by NM, 19-Jul-2006.) |
| Ref | Expression |
|---|---|
| eltop | ⊢ (𝐽 ∈ Top → (𝐴 ∈ 𝐽 ↔ 𝐴 ⊆ ∪ (𝐽 ∩ 𝒫 𝐴))) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | tgtop 23002 | . . 3 ⊢ (𝐽 ∈ Top → (topGen‘𝐽) = 𝐽) | |
| 2 | 1 | eleq2d 2838 | . 2 ⊢ (𝐽 ∈ Top → (𝐴 ∈ (topGen‘𝐽) ↔ 𝐴 ∈ 𝐽)) |
| 3 | eltg 22986 | . 2 ⊢ (𝐽 ∈ Top → (𝐴 ∈ (topGen‘𝐽) ↔ 𝐴 ⊆ ∪ (𝐽 ∩ 𝒫 𝐴))) | |
| 4 | 2, 3 | bitr3d 283 | 1 ⊢ (𝐽 ∈ Top → (𝐴 ∈ 𝐽 ↔ 𝐴 ⊆ ∪ (𝐽 ∩ 𝒫 𝐴))) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 ↔ wb 208 ∈ wcel 2132 ∩ cin 3894 ⊆ wss 3895 𝒫 cpw 4545 ∪ cuni 4855 ‘cfv 6506 topGenctg 17438 Topctop 22922 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1805 ax-4 1819 ax-5 1920 ax-6 1977 ax-7 2018 ax-8 2134 ax-9 2142 ax-10 2165 ax-11 2181 ax-12 2202 ax-ext 2724 ax-sep 5236 ax-nul 5246 ax-pow 5312 ax-pr 5380 ax-un 7703 |
| This theorem depends on definitions: df-bi 209 df-an 399 df-or 857 df-3an 1097 df-tru 1553 df-fal 1563 df-ex 1790 df-nf 1794 df-sb 2081 df-mo 2556 df-eu 2586 df-clab 2731 df-cleq 2744 df-clel 2827 df-nfc 2901 df-ne 2948 df-ral 3067 df-rex 3077 df-rab 3405 df-v 3446 df-dif 3898 df-un 3900 df-in 3902 df-ss 3912 df-nul 4277 df-if 4471 df-pw 4547 df-sn 4573 df-pr 4575 df-op 4579 df-uni 4856 df-br 5091 df-opab 5153 df-mpt 5172 df-id 5531 df-xp 5642 df-rel 5643 df-cnv 5644 df-co 5645 df-dm 5646 df-iota 6462 df-fun 6508 df-fv 6514 df-topgen 17444 df-top 22923 |
| This theorem is referenced by: (None) |
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