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| Mirrors > Home > ILE Home > Th. List > eltop | 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 14791 | . . 3 ⊢ (𝐽 ∈ Top → (topGen‘𝐽) = 𝐽) | |
| 2 | 1 | eleq2d 2301 | . 2 ⊢ (𝐽 ∈ Top → (𝐴 ∈ (topGen‘𝐽) ↔ 𝐴 ∈ 𝐽)) |
| 3 | eltg 14775 | . 2 ⊢ (𝐽 ∈ Top → (𝐴 ∈ (topGen‘𝐽) ↔ 𝐴 ⊆ ∪ (𝐽 ∩ 𝒫 𝐴))) | |
| 4 | 2, 3 | bitr3d 190 | 1 ⊢ (𝐽 ∈ Top → (𝐴 ∈ 𝐽 ↔ 𝐴 ⊆ ∪ (𝐽 ∩ 𝒫 𝐴))) |
| Colors of variables: wff set class |
| Syntax hints: → wi 4 ↔ wb 105 ∈ wcel 2202 ∩ cin 3199 ⊆ wss 3200 𝒫 cpw 3652 ∪ cuni 3893 ‘cfv 5326 topGenctg 13336 Topctop 14720 |
| 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 716 ax-5 1495 ax-7 1496 ax-gen 1497 ax-ie1 1541 ax-ie2 1542 ax-8 1552 ax-10 1553 ax-11 1554 ax-i12 1555 ax-bndl 1557 ax-4 1558 ax-17 1574 ax-i9 1578 ax-ial 1582 ax-i5r 1583 ax-13 2204 ax-14 2205 ax-ext 2213 ax-sep 4207 ax-pow 4264 ax-pr 4299 ax-un 4530 |
| This theorem depends on definitions: df-bi 117 df-3an 1006 df-tru 1400 df-nf 1509 df-sb 1811 df-eu 2082 df-mo 2083 df-clab 2218 df-cleq 2224 df-clel 2227 df-nfc 2363 df-ral 2515 df-rex 2516 df-v 2804 df-sbc 3032 df-un 3204 df-in 3206 df-ss 3213 df-pw 3654 df-sn 3675 df-pr 3676 df-op 3678 df-uni 3894 df-br 4089 df-opab 4151 df-mpt 4152 df-id 4390 df-xp 4731 df-rel 4732 df-cnv 4733 df-co 4734 df-dm 4735 df-iota 5286 df-fun 5328 df-fv 5334 df-topgen 13342 df-top 14721 |
| This theorem is referenced by: (None) |
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