| 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 7549 |
. 2
| |
| 2 | anass 439 |
. 2
| |
| 3 | ancom 435 |
. . 3
| |
| 4 | 3anass 777 |
. . . 4
| |
| 5 | 4 | anbi1i 480 |
. . 3
|
| 6 | ssexg 2711 |
. . . . . . 7
| |
| 7 | pwexg 2736 |
. . . . . . 7
| |
| 8 | 6, 7 | sylan2 451 |
. . . . . 6
|
| 9 | 8 | 3adant2 796 |
. . . . 5
|
| 10 | istopg 7538 |
. . . . 5
| |
| 11 | 9, 10 | syl 10 |
. . . 4
|
| 12 | 11 | pm5.32i 643 |
. . 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 7551 |
| This theorem was proved from axioms: ax-1 4 ax-2 5 ax-3 6 ax-mp 7 ax-7 959 ax-gen 960 ax-8 961 ax-10 963 ax-11 964 ax-12 965 ax-13 966 ax-14 967 ax-17 968 ax-4 970 ax-5o 972 ax-6o 975 ax-9o 1119 ax-10o 1136 ax-16 1206 ax-11o 1213 ax-ext 1452 ax-sep 2693 ax-pow 2732 ax-pr 2769 ax-un 2857 ax-reg 4565 |
| This theorem depends on definitions: df-bi 147 df-or 224 df-an 225 df-3an 775 df-ex 978 df-sb 1168 df-eu 1375 df-mo 1376 df-clab 1457 df-cleq 1462 df-clel 1465 df-ne 1579 df-ral 1641 df-rex 1642 df-v 1803 df-dif 2039 df-un 2040 df-in 2041 df-ss 2043 df-nul 2271 df-pw 2392 df-sn 2402 df-pr 2403 df-op 2406 df-uni 2494 df-br 2610 df-opab 2657 df-xp 3174 df-rel 3175 df-top 7534 df-topsp 7535 |