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Mirrors > Home > MPE Home > Th. List > rexeq | Structured version Visualization version GIF version |
Description: Equality theorem for restricted existential quantifier. (Contributed by NM, 29-Oct-1995.) Remove usage of ax-10 2145, ax-11 2161, and ax-12 2177. (Revised by Steven Nguyen, 30-Apr-2023.) |
Ref | Expression |
---|---|
rexeq | ⊢ (𝐴 = 𝐵 → (∃𝑥 ∈ 𝐴 𝜑 ↔ ∃𝑥 ∈ 𝐵 𝜑)) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | biidd 264 | . 2 ⊢ (𝐴 = 𝐵 → (𝜑 ↔ 𝜑)) | |
2 | 1 | rexeqbi1dv 3404 | 1 ⊢ (𝐴 = 𝐵 → (∃𝑥 ∈ 𝐴 𝜑 ↔ ∃𝑥 ∈ 𝐵 𝜑)) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ↔ wb 208 = wceq 1537 ∃wrex 3139 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1796 ax-4 1810 ax-5 1911 ax-6 1970 ax-7 2015 ax-8 2116 ax-9 2124 ax-ext 2793 |
This theorem depends on definitions: df-bi 209 df-an 399 df-ex 1781 df-cleq 2814 df-clel 2893 df-rex 3144 |
This theorem is referenced by: rexeqi 3414 rexeqdv 3416 rexeqbi1dvOLD 3418 unieqOLD 4850 exss 5355 qseq1 8343 1sdom 8721 pssnn 8736 indexfi 8832 supeq1 8909 bnd2 9322 dfac2b 9556 cflem 9668 cflecard 9675 cfeq0 9678 cfsuc 9679 cfflb 9681 cofsmo 9691 elwina 10108 eltskg 10172 rankcf 10199 elnp 10409 elnpi 10410 genpv 10421 xrsupsslem 12701 xrinfmsslem 12702 xrsupss 12703 xrinfmss 12704 hashge2el2difr 13840 isdrs 17544 isipodrs 17771 neifval 21707 ishaus 21930 2ndc1stc 22059 1stcrest 22061 lly1stc 22104 isref 22117 islocfin 22125 tx1stc 22258 isust 22812 iscfilu 22897 met1stc 23131 iscfil 23868 ishpg 26545 isgrpo 28274 chne0 29271 pstmfval 31136 dya2iocuni 31541 satfvsuc 32608 satf0suc 32623 sat1el2xp 32626 fmlasuc0 32631 noetalem3 33219 altxpeq1 33434 altxpeq2 33435 elhf2 33636 bj-sngleq 34282 cover2g 35005 indexdom 35024 istotbnd 35062 pmapglb2xN 36923 paddval 36949 elpadd0 36960 diophrex 39392 hbtlem1 39743 hbtlem7 39745 mnuop23d 40622 sprval 43661 sprsymrelfvlem 43672 sprsymrelfv 43676 sprsymrelfo 43679 prprval 43696 |
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