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Mirrors > Home > MPE Home > Th. List > ceqsexv | Structured version Visualization version GIF version |
Description: Elimination of an existential quantifier, using implicit substitution. (Contributed by NM, 2-Mar-1995.) |
Ref | Expression |
---|---|
ceqsexv.1 | ⊢ 𝐴 ∈ V |
ceqsexv.2 | ⊢ (𝑥 = 𝐴 → (𝜑 ↔ 𝜓)) |
Ref | Expression |
---|---|
ceqsexv | ⊢ (∃𝑥(𝑥 = 𝐴 ∧ 𝜑) ↔ 𝜓) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | nfv 1915 | . 2 ⊢ Ⅎ𝑥𝜓 | |
2 | ceqsexv.1 | . 2 ⊢ 𝐴 ∈ V | |
3 | ceqsexv.2 | . 2 ⊢ (𝑥 = 𝐴 → (𝜑 ↔ 𝜓)) | |
4 | 1, 2, 3 | ceqsex 3542 | 1 ⊢ (∃𝑥(𝑥 = 𝐴 ∧ 𝜑) ↔ 𝜓) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ↔ wb 208 ∧ wa 398 = wceq 1537 ∃wex 1780 ∈ wcel 2114 Vcvv 3496 |
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-12 2177 ax-ext 2795 |
This theorem depends on definitions: df-bi 209 df-an 399 df-ex 1781 df-nf 1785 df-cleq 2816 df-clel 2895 |
This theorem is referenced by: ceqsexv2d 3544 ceqsex2v 3546 ceqsex3v 3547 gencbvex 3551 euxfr2w 3713 euxfr2 3715 inuni 5248 eqvinop 5380 elvvv 5629 dmfco 6759 fndmdif 6814 fndmin 6817 fmptco 6893 abrexco 7005 uniuni 7486 elxp4 7629 elxp5 7630 brtpos2 7900 xpsnen 8603 xpcomco 8609 xpassen 8613 dfac5lem2 9552 cf0 9675 ltexprlem4 10463 pceu 16185 4sqlem12 16294 vdwapun 16312 gsumval3eu 19026 dprd2d2 19168 znleval 20703 metrest 23136 fmptcof2 30404 fpwrelmapffslem 30470 cusgredgex 32370 dfdm5 33018 dfrn5 33019 elima4 33021 brtxp 33343 brpprod 33348 elfix 33366 dfiota3 33386 brimg 33400 brapply 33401 brsuccf 33404 funpartlem 33405 brrestrict 33412 dfrecs2 33413 dfrdg4 33414 lshpsmreu 36247 isopos 36318 islpln5 36673 islvol5 36717 cdlemftr3 37703 dibelval3 38285 dicelval3 38318 mapdpglem3 38813 hdmapglem7a 39065 diophrex 39379 |
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