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| Description: Equality theorem for the subclass relationship. |
| Ref | Expression |
|---|---|
| sseq2 |
|
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | sstr2 1510 |
. . . 4
| |
| 2 | 1 | com12 13 |
. . 3
|
| 3 | sstr2 1510 |
. . . 4
| |
| 4 | 3 | com12 13 |
. . 3
|
| 5 | 2, 4 | anim12i 268 |
. 2
|
| 6 | eqss 1516 |
. 2
| |
| 7 | bi 396 |
. 2
| |
| 8 | 5, 6, 7 | 3imtr4 192 |
1
|
| Colors of variables: wff set class |
| Syntax hints: |
| This theorem is referenced by: sseq12 1523 sseq2i 1525 sseq2d 1528 eqimss 1548 psseq2 1560 ssexg 1702 un00 1728 disjpss 1738 pweq 1800 ssuni 1937 ssintub 1981 intmin 1982 iunpw 2040 treq 2047 ordunidif 2260 ordssun 2330 limomss 2378 findsg 2398 tfindsg 2402 fununi 2705 funcnvuni 2706 feq3 2750 oawordeu 3157 oawordexr 3158 ereq 3206 domeng 3285 undom 3342 sbthlem4 3352 sbthlem5 3353 mapdom2lem 3388 php3 3411 inf3lema 3460 tz9.1 3490 scottex 3541 aceq3 3556 ac7g 3570 cardlim 3657 isinfcard 3692 cflem 3700 cfval 3701 cflecard 3707 cfsuc 3709 infxpidmlem7 4939 infxpidmlem11 4943 omls 5251 ococint 5298 spanvalt 5300 hsupval2t 5301 spanclt 5305 chsupsn 5313 shlubt 5355 shsumval2 5361 chj00 5408 chsscon3t 5417 chlejb1t 5429 chnlet 5431 pjoml3t 5517 stcltr1 5707 mdbr 5726 dmdbr 5731 dmdi 5732 chrelat2t 5761 atcvat4 5775 |
| This theorem was proved from axioms: ax-1 3 ax-2 4 ax-3 5 ax-mp 6 ax-4 673 ax-5 674 ax-6 675 ax-7 676 ax-gen 677 ax-8 798 ax-9 799 ax-10 800 ax-11 801 ax-12 802 ax-16 922 ax-17 925 ax-ext 1074 |
| This theorem depends on definitions: df-bi 128 df-an 198 df-ex 679 df-sb 853 df-clab 1093 df-cleq 1097 df-clel 1099 df-in 1491 df-ss 1492 |