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| Description: Membership in a topology generated by a basis. |
| Ref | Expression |
|---|---|
| eltg3t |
|
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | tgval3t 7604 |
. . 3
| |
| 2 | 1 | eleq2d 1540 |
. 2
|
| 3 | visset 1811 |
. . . . . . 7
| |
| 4 | 3 | uniex 2867 |
. . . . . 6
|
| 5 | eleq1 1533 |
. . . . . 6
| |
| 6 | 4, 5 | mpbiri 194 |
. . . . 5
|
| 7 | 6 | adantl 388 |
. . . 4
|
| 8 | 7 | 19.23aiv 1295 |
. . 3
|
| 9 | eqeq1 1480 |
. . . . 5
| |
| 10 | 9 | anbi2d 615 |
. . . 4
|
| 11 | 10 | exbidv 1279 |
. . 3
|
| 12 | 8, 11 | elab3 1901 |
. 2
|
| 13 | 2, 12 | syl6bb 535 |
1
|
| Colors of variables: wff set class |
| Syntax hints: |
| This theorem is referenced by: tgtopt 7607 eltop3t 7610 basgen2t 7618 bastop 7621 |
| This theorem was proved from axioms: ax-1 4 ax-2 5 ax-3 6 ax-mp 7 ax-7 961 ax-gen 962 ax-8 963 ax-9 964 ax-10 965 ax-11 966 ax-12 967 ax-13 968 ax-14 969 ax-17 970 ax-4 972 ax-5o 974 ax-6o 977 ax-9o 1122 ax-10o 1139 ax-16 1210 ax-11o 1218 ax-ext 1459 ax-sep 2700 ax-pow 2739 ax-pr 2776 ax-un 2863 |
| This theorem depends on definitions: df-bi 147 df-or 224 df-an 225 df-3an 776 df-ex 980 df-sb 1172 df-eu 1382 df-mo 1383 df-clab 1464 df-cleq 1469 df-clel 1472 df-ne 1586 df-ral 1648 df-rex 1649 df-rab 1651 df-v 1810 df-dif 2047 df-un 2048 df-in 2049 df-ss 2051 df-nul 2279 df-pw 2400 df-sn 2410 df-pr 2411 df-op 2414 df-uni 2501 df-br 2617 df-opab 2664 df-id 2832 df-xp 3181 df-rel 3182 df-cnv 3183 df-co 3184 df-dm 3185 df-rn 3186 df-res 3187 df-ima 3188 df-fun 3189 df-fv 3195 df-top 7571 df-bases 7573 df-topgen 7574 |