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| Description: Commutative law for intersection of classes. Exercise 7 of [TakeutiZaring] p. 17. |
| Ref | Expression |
|---|---|
| incom |
|
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | ancom 435 |
. . 3
| |
| 2 | elin 2204 |
. . 3
| |
| 3 | elin 2204 |
. . 3
| |
| 4 | 1, 2, 3 | 3bitr4 183 |
. 2
|
| 5 | 4 | eqriv 1473 |
1
|
| Colors of variables: wff set class |
| Syntax hints: |
| This theorem is referenced by: ineq2 2208 in12 2221 in23 2222 sseqin2 2226 inss2 2228 sslin 2232 indir 2250 symdif1 2262 dfrab2 2271 difdifdir 2343 inex2 2713 ordtri3or 2975 orduniss2 3086 onnev 3238 dmres 3376 rescom 3380 resopab 3391 imadisj 3418 ndmima 3430 dmresv 3486 rescnvcnv 3489 resdmres 3493 fnresdisj 3593 fvsnun1 3790 curry1 4091 mapdom2lem 4482 mapunen 4491 limensuci 4495 phplem2 4498 pssnn 4522 zfreg2 4580 zfregs 4630 kmlem11 4758 kmlem12 4759 brdom7disj 4787 brdom6disj 4788 subtop 7606 indistop 7608 fctop 7610 cctop 7612 elcls 7664 islp2 7707 qdensere 7711 cnconst 7740 metssba 7769 metssba2 7770 lpbl 7842 lmsslem 7914 lmss 7915 bcthlem9 7969 grothprim 8738 ococ 9202 orthin 9325 chjo 9366 ledir 9415 pjoml2 9485 pjoml4 9487 cmcmlem 9491 cmbr3 9500 cmm2 9507 cm0t 9509 fh1t 9518 fh2t 9519 cm2jt 9520 qlaxr3 9534 dfbdop2 9743 pjclem2 10080 stm1r 10127 golem1 10154 dmdbr5 10191 mddmd 10192 cvmd 10207 mdsldmd1 10214 csmdsym 10217 mdexch 10218 cvexch 10252 atssmat 10261 atoml 10265 atoml2 10266 atord 10267 atcvatlem 10268 irredlem1 10273 irredlem2 10274 irredlem3 10275 atcvat4 10280 atabs 10284 mdsymlem1 10286 dmdbr6at 10306 cdj3lem3 10321 uninqs 10400 infi1 10405 inpws2 10410 moec 10415 neiopne 10427 cnfilca 10510 sfvlim 10522 stoi 10555 |
| 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-10 965 ax-12 967 ax-17 970 ax-4 972 ax-5o 974 ax-6o 977 ax-9o 1122 ax-10o 1139 ax-16 1209 ax-11o 1217 ax-ext 1458 |
| This theorem depends on definitions: df-bi 147 df-an 225 df-ex 980 df-sb 1171 df-clab 1463 df-cleq 1468 df-clel 1471 df-v 1809 df-in 2048 |