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| Description: Substitution of equality into a subclass relationship. |
| Ref | Expression |
|---|---|
| eqsstr.1 |
|
| eqsstr.2 |
|
| Ref | Expression |
|---|---|
| eqsstr |
|
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | eqsstr.2 |
. 2
| |
| 2 | eqsstr.1 |
. . 3
| |
| 3 | 2 | sseq1i 1524 |
. 2
|
| 4 | 1, 3 | mpbir 165 |
1
|
| Colors of variables: wff set class |
| Syntax hints: |
| This theorem is referenced by: eqsstr3 1531 ssrab 1556 opabss 2100 dmopabss 2540 dmexg 2551 rnexg 2569 resss 2587 relres 2591 rnin 2645 cnvcnvss 2662 funi 2692 f0 2772 tz6.12-2 2845 tz7.48-2 2995 dmoprabss 3032 oawordeulem 3156 ecopoprdm 3245 ecopoprsym 3246 ecopoprtrn 3247 sbthlem7 3355 inf3lem1 3464 rankval3 3525 rankuni 3533 rankuniss 3534 cplem1 3545 ac6lem 3575 zornlem1 3603 zornlem3 3605 zornlem4 3606 zornlem5 3607 imadomg 3616 hta 3619 pinn 3800 niex 3803 ltrelpi 3811 dmaddpi 3812 dmmulpi 3813 enqex 3842 ltrelpq 3845 dmaddpq 3853 dmmulpq 3855 ltrelpr 3895 enrex 3972 ltrelsr 3974 dmaddsr 3988 dmmulsr 3989 ltrelre 4046 nn0ssre 4538 nn0ssz 4578 sqrlem6 4736 fac0 4871 chsssh 5129 projlem8 5200 shscl 5282 shjshs 5412 5oa 5551 3oalem4 5555 pjf 5588 atssch 5741 |
| 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 |