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Mirrors > Home > ILE Home > Th. List > eltg4i | Unicode version |
Description: An open set in a topology generated by a basis is the union of all basic open sets contained in it. (Contributed by Stefan O'Rear, 22-Feb-2015.) |
Ref | Expression |
---|---|
eltg4i |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | df-topgen 12519 | . . . . . . 7 | |
2 | 1 | funmpt2 5221 | . . . . . 6 |
3 | funrel 5199 | . . . . . 6 | |
4 | 2, 3 | ax-mp 5 | . . . . 5 |
5 | relelfvdm 5512 | . . . . 5 | |
6 | 4, 5 | mpan 421 | . . . 4 |
7 | eltg 12599 | . . . 4 | |
8 | 6, 7 | syl 14 | . . 3 |
9 | 8 | ibi 175 | . 2 |
10 | inss2 3338 | . . . . 5 | |
11 | 10 | unissi 3806 | . . . 4 |
12 | unipw 4189 | . . . 4 | |
13 | 11, 12 | sseqtri 3171 | . . 3 |
14 | 13 | a1i 9 | . 2 |
15 | 9, 14 | eqssd 3154 | 1 |
Colors of variables: wff set class |
Syntax hints: wi 4 wb 104 wceq 1342 wcel 2135 cab 2150 cvv 2721 cin 3110 wss 3111 cpw 3553 cuni 3783 cdm 4598 wrel 4603 wfun 5176 cfv 5182 ctg 12513 |
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 699 ax-5 1434 ax-7 1435 ax-gen 1436 ax-ie1 1480 ax-ie2 1481 ax-8 1491 ax-10 1492 ax-11 1493 ax-i12 1494 ax-bndl 1496 ax-4 1497 ax-17 1513 ax-i9 1517 ax-ial 1521 ax-i5r 1522 ax-13 2137 ax-14 2138 ax-ext 2146 ax-sep 4094 ax-pow 4147 ax-pr 4181 ax-un 4405 |
This theorem depends on definitions: df-bi 116 df-3an 969 df-tru 1345 df-nf 1448 df-sb 1750 df-eu 2016 df-mo 2017 df-clab 2151 df-cleq 2157 df-clel 2160 df-nfc 2295 df-ral 2447 df-rex 2448 df-v 2723 df-sbc 2947 df-un 3115 df-in 3117 df-ss 3124 df-pw 3555 df-sn 3576 df-pr 3577 df-op 3579 df-uni 3784 df-br 3977 df-opab 4038 df-mpt 4039 df-id 4265 df-xp 4604 df-rel 4605 df-cnv 4606 df-co 4607 df-dm 4608 df-iota 5147 df-fun 5184 df-fv 5190 df-topgen 12519 |
This theorem is referenced by: eltg3 12604 tgdom 12619 tgidm 12621 |
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