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| Description: Substitution of equality into a subclass relationship. |
| Ref | Expression |
|---|---|
| sseqtr.1 |
|
| sseqtr.2 |
|
| Ref | Expression |
|---|---|
| sseqtr |
|
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | sseqtr.1 |
. 2
| |
| 2 | sseqtr.2 |
. . 3
| |
| 3 | 2 | sseq2i 2084 |
. 2
|
| 4 | 1, 3 | mpbi 189 |
1
|
| Colors of variables: wff set class |
| Syntax hints: |
| This theorem is referenced by: sseqtr4 2092 eqimssi 2109 abssi 2120 ssun2 2192 opabss 2665 unixpss 3255 0ima 3418 oelim2 4219 ecopoprdm 4306 sbthlem7 4446 abfii3 4550 abfii4 4551 rankuni 4685 rankc2 4693 rankxpu 4698 rankxplim 4699 cf0 4897 unirnioo 6353 unbenlem 7483 cncnplem1 7753 nmcn3 8327 abscncfALT 8330 choc1 9279 shlej1 9336 chub2 9381 span0 9453 spanun 9455 sshhococ 9457 chsup0 9459 spansnpj 9491 nmcopexlem4 9945 nmcfnexlem4 9974 pjima 10095 pj3 10127 shatomistic 10279 hatomistic 10280 atcvat4 10315 dmhmph 10513 dtopcl 10566 reldded 10625 relrded 10626 reldcat 10646 relrcat 10647 |
| 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 1210 ax-11o 1218 ax-ext 1459 |
| This theorem depends on definitions: df-bi 147 df-an 225 df-ex 980 df-sb 1172 df-clab 1464 df-cleq 1469 df-clel 1472 df-in 2049 df-ss 2051 |