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Mirrors > Home > ILE Home > Th. List > fiinbas | Unicode version |
Description: If a set is closed under finite intersection, then it is a basis for a topology. (Contributed by Jeff Madsen, 2-Sep-2009.) |
Ref | Expression |
---|---|
fiinbas |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | ssid 3112 | . . . . . . . 8 | |
2 | eleq2 2201 | . . . . . . . . . 10 | |
3 | sseq1 3115 | . . . . . . . . . 10 | |
4 | 2, 3 | anbi12d 464 | . . . . . . . . 9 |
5 | 4 | rspcev 2784 | . . . . . . . 8 |
6 | 1, 5 | mpanr2 434 | . . . . . . 7 |
7 | 6 | ralrimiva 2503 | . . . . . 6 |
8 | 7 | a1i 9 | . . . . 5 |
9 | 8 | ralimdv 2498 | . . . 4 |
10 | 9 | ralimdv 2498 | . . 3 |
11 | isbasis2g 12201 | . . 3 | |
12 | 10, 11 | sylibrd 168 | . 2 |
13 | 12 | imp 123 | 1 |
Colors of variables: wff set class |
Syntax hints: wi 4 wa 103 wceq 1331 wcel 1480 wral 2414 wrex 2415 cin 3065 wss 3066 ctb 12198 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 105 ax-ia2 106 ax-ia3 107 ax-io 698 ax-5 1423 ax-7 1424 ax-gen 1425 ax-ie1 1469 ax-ie2 1470 ax-8 1482 ax-10 1483 ax-11 1484 ax-i12 1485 ax-bndl 1486 ax-4 1487 ax-17 1506 ax-i9 1510 ax-ial 1514 ax-i5r 1515 ax-ext 2119 |
This theorem depends on definitions: df-bi 116 df-tru 1334 df-nf 1437 df-sb 1736 df-clab 2124 df-cleq 2130 df-clel 2133 df-nfc 2268 df-ral 2419 df-rex 2420 df-v 2683 df-in 3072 df-ss 3079 df-pw 3507 df-uni 3732 df-bases 12199 |
This theorem is referenced by: qtopbasss 12679 |
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