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| Description: A criterion for determining whether one topology is finer than another. Lemma 2.2 of [Munkres] p. 80 using abbreviations. |
| Ref | Expression |
|---|---|
| tgss3t |
|
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | tgss2t 7637 |
. 2
| |
| 2 | ralcom 1774 |
. . 3
| |
| 3 | elin 2207 |
. . . . . . . 8
| |
| 4 | anass 439 |
. . . . . . . . . . 11
| |
| 5 | elin 2207 |
. . . . . . . . . . . . 13
| |
| 6 | 5 | anbi1i 481 |
. . . . . . . . . . . 12
|
| 7 | ancom 435 |
. . . . . . . . . . . 12
| |
| 8 | 6, 7 | bitr3 175 |
. . . . . . . . . . 11
|
| 9 | ancom 435 |
. . . . . . . . . . . . 13
| |
| 10 | visset 1813 |
. . . . . . . . . . . . . . 15
| |
| 11 | 10 | elpw 2404 |
. . . . . . . . . . . . . 14
|
| 12 | 11 | anbi2i 480 |
. . . . . . . . . . . . 13
|
| 13 | 9, 12 | bitr 173 |
. . . . . . . . . . . 12
|
| 14 | 13 | anbi2i 480 |
. . . . . . . . . . 11
|
| 15 | 4, 8, 14 | 3bitr3r 182 |
. . . . . . . . . 10
|
| 16 | 15 | exbii 1051 |
. . . . . . . . 9
|
| 17 | df-rex 1650 |
. . . . . . . . 9
| |
| 18 | eluni 2506 |
. . . . . . . . 9
| |
| 19 | 16, 17, 18 | 3bitr4r 184 |
. . . . . . . 8
|
| 20 | 3, 19 | imbi12i 188 |
. . . . . . 7
|
| 21 | impexp 347 |
. . . . . . 7
| |
| 22 | 20, 21 | bitr 173 |
. . . . . 6
|
| 23 | 22 | albii 999 |
. . . . 5
|
| 24 | dfss2 2058 |
. . . . 5
| |
| 25 | df-ral 1649 |
. . . . 5
| |
| 26 | 23, 24, 25 | 3bitr4r 184 |
. . . 4
|
| 27 | 26 | ralbii 1667 |
. . 3
|
| 28 | 2, 27 | bitr 173 |
. 2
|
| 29 | 1, 28 | syl6bb 536 |
1
|
| Colors of variables: wff set class |
| Syntax hints: |
| This theorem was proved from axioms: ax-1 4 ax-2 5 ax-3 6 ax-mp 7 ax-7 962 ax-gen 963 ax-8 964 ax-9 965 ax-10 966 ax-11 967 ax-12 968 ax-13 969 ax-14 970 ax-17 971 ax-4 973 ax-5o 975 ax-6o 978 ax-9o 1123 ax-10o 1140 ax-16 1210 ax-11o 1218 ax-ext 1459 ax-sep 2703 ax-pow 2742 ax-pr 2779 ax-un 2866 |
| This theorem depends on definitions: df-bi 147 df-or 224 df-an 225 df-3an 777 df-ex 981 df-sb 1172 df-eu 1382 df-mo 1383 df-clab 1464 df-cleq 1469 df-clel 1472 df-ne 1587 df-ral 1649 df-rex 1650 df-rab 1652 df-v 1812 df-dif 2049 df-un 2050 df-in 2051 df-ss 2053 df-nul 2281 df-pw 2402 df-sn 2412 df-pr 2413 df-op 2416 df-uni 2504 df-br 2620 df-opab 2667 df-id 2835 df-xp 3184 df-rel 3185 df-cnv 3186 df-co 3187 df-dm 3188 df-rn 3189 df-res 3190 df-ima 3191 df-fun 3192 df-fv 3198 df-bases 7594 df-topgen 7595 |