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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 3488 | 1 ⊢ (∃𝑥(𝑥 = 𝐴 ∧ 𝜑) ↔ 𝜓) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ↔ wb 209 ∧ wa 399 = wceq 1538 ∃wex 1781 ∈ wcel 2111 Vcvv 3441 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1797 ax-4 1811 ax-5 1911 ax-6 1970 ax-7 2015 ax-8 2113 ax-9 2121 ax-12 2175 ax-ext 2770 |
This theorem depends on definitions: df-bi 210 df-an 400 df-ex 1782 df-nf 1786 df-cleq 2791 df-clel 2870 |
This theorem is referenced by: ceqsexv2d 3490 ceqsex2v 3492 ceqsex3v 3493 gencbvex 3497 euxfr2w 3659 euxfr2 3661 inuni 5210 eqvinop 5343 elvvv 5591 dmfco 6734 fndmdif 6789 fndmin 6792 fmptco 6868 abrexco 6981 uniuni 7464 elxp4 7609 elxp5 7610 brtpos2 7881 xpsnen 8584 xpcomco 8590 xpassen 8594 dfac5lem2 9535 cf0 9662 ltexprlem4 10450 pceu 16173 4sqlem12 16282 vdwapun 16300 gsumval3eu 19017 dprd2d2 19159 znleval 20246 metrest 23131 fmptcof2 30420 fpwrelmapffslem 30494 cusgredgex 32481 dfdm5 33129 dfrn5 33130 elima4 33132 brtxp 33454 brpprod 33459 elfix 33477 dfiota3 33497 brimg 33511 brapply 33512 brsuccf 33515 funpartlem 33516 brrestrict 33523 dfrecs2 33524 dfrdg4 33525 lshpsmreu 36405 isopos 36476 islpln5 36831 islvol5 36875 cdlemftr3 37861 dibelval3 38443 dicelval3 38476 mapdpglem3 38971 hdmapglem7a 39223 diophrex 39716 |
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