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Mirrors > Home > MPE Home > Th. List > 2exbii | Structured version Visualization version GIF version |
Description: Inference adding two existential quantifiers to both sides of an equivalence. (Contributed by NM, 16-Mar-1995.) |
Ref | Expression |
---|---|
2exbii.1 | ⊢ (𝜑 ↔ 𝜓) |
Ref | Expression |
---|---|
2exbii | ⊢ (∃𝑥∃𝑦𝜑 ↔ ∃𝑥∃𝑦𝜓) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | 2exbii.1 | . . 3 ⊢ (𝜑 ↔ 𝜓) | |
2 | 1 | exbii 1844 | . 2 ⊢ (∃𝑦𝜑 ↔ ∃𝑦𝜓) |
3 | 2 | exbii 1844 | 1 ⊢ (∃𝑥∃𝑦𝜑 ↔ ∃𝑥∃𝑦𝜓) |
Colors of variables: wff setvar class |
Syntax hints: ↔ wb 208 ∃wex 1776 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1792 ax-4 1806 |
This theorem depends on definitions: df-bi 209 df-ex 1777 |
This theorem is referenced by: 3exbii 1846 2exanali 1856 4exdistrv 1953 3exdistr 1958 cbvex4vw 2045 eeeanv 2367 ee4anv 2368 2exsb 2375 cbvex4v 2433 2sb5rf 2492 sbel2x 2494 2mo2 2728 rexcomOLD 3356 rexcomf 3358 reeanlem 3365 ceqsex3v 3545 ceqsex4v 3546 ceqsex8v 3548 copsexgw 5373 copsexg 5374 opelopabsbALT 5408 opabn0 5432 elxp2 5573 rabxp 5594 elxp3 5612 elvv 5620 elvvv 5621 copsex2gb 5673 elcnv2 5742 cnvuni 5751 xpdifid 6019 coass 6112 fununi 6423 dfmpt3 6476 tpres 6957 dfoprab2 7206 dmoprab 7249 rnoprab 7251 mpomptx 7259 resoprab 7264 elrnmpores 7282 ov3 7305 ov6g 7306 uniuni 7478 opabex3rd 7661 oprabex3 7672 wfrlem4 7952 oeeu 8223 xpassen 8605 zorn2lem6 9917 ltresr 10556 axaddf 10561 axmulf 10562 hashfun 13792 hash2prb 13824 5oalem7 29431 mpomptxf 30419 eulerpartlemgvv 31629 bnj600 32186 bnj916 32200 bnj983 32218 bnj986 32222 bnj996 32223 bnj1021 32233 dfacycgr1 32386 satfv1 32605 elima4 33014 brtxp2 33337 brpprod3a 33342 brpprod3b 33343 elfuns 33371 brcart 33388 brimg 33393 brapply 33394 brsuccf 33397 brrestrict 33405 dfrdg4 33407 ellines 33608 bj-cbvex4vv 34122 itg2addnclem3 34939 brxrn2 35621 dfxrn2 35622 ecxrn 35633 inxpxrn 35637 rnxrn 35640 dalem20 36823 dvhopellsm 38247 diblsmopel 38301 en2pr 39899 pm11.52 40712 pm11.6 40717 pm11.7 40721 opelopab4 40878 stoweidlem35 42314 fundcmpsurbijinj 43564 mpomptx2 44377 |
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