| Metamath Proof Explorer |
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Related theorems Unicode version |
| Description: A standard textbook definition of a topological space. |
| Ref | Expression |
|---|---|
| istps3 |
|
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | istps2 7557 |
. 2
| |
| 2 | anass 439 |
. 2
| |
| 3 | ancom 435 |
. . 3
| |
| 4 | 3anass 778 |
. . . 4
| |
| 5 | 4 | anbi1i 481 |
. . 3
|
| 6 | ssexg 2716 |
. . . . . . 7
| |
| 7 | pwexg 2741 |
. . . . . . 7
| |
| 8 | 6, 7 | sylan2 451 |
. . . . . 6
|
| 9 | 8 | 3adant2 797 |
. . . . 5
|
| 10 | istopg 7546 |
. . . . 5
| |
| 11 | 9, 10 | syl 10 |
. . . 4
|
| 12 | 11 | pm5.32i 644 |
. . 3
|
| 13 | 3, 5, 12 | 3bitr2 179 |
. 2
|
| 14 | 1, 2, 13 | 3bitr 177 |
1
|
| Colors of variables: wff set class |
| Syntax hints: |
| This theorem is referenced by: istps4 7559 |
| This theorem was proved from axioms: ax-1 4 ax-2 5 ax-3 6 ax-mp 7 ax-7 960 ax-gen 961 ax-8 962 ax-10 964 ax-11 965 ax-12 966 ax-13 967 ax-14 968 ax-17 969 ax-4 971 ax-5o 973 ax-6o 976 ax-9o 1121 ax-10o 1138 ax-16 1208 ax-11o 1216 ax-ext 1457 ax-sep 2698 ax-pow 2737 ax-pr 2774 ax-un 2861 ax-reg 4573 |
| This theorem depends on definitions: df-bi 147 df-or 224 df-an 225 df-3an 776 df-ex 979 df-sb 1170 df-eu 1380 df-mo 1381 df-clab 1462 df-cleq 1467 df-clel 1470 df-ne 1584 df-ral 1646 df-rex 1647 df-v 1808 df-dif 2045 df-un 2046 df-in 2047 df-ss 2049 df-nul 2277 df-pw 2398 df-sn 2408 df-pr 2409 df-op 2412 df-uni 2499 df-br 2615 df-opab 2662 df-xp 3179 df-rel 3180 df-top 7542 df-topsp 7543 |