Metamath Proof Explorer |
< Previous
Next >
Nearby theorems |
||
Mirrors > Home > MPE Home > Th. List > pm5.21nii | Structured version Visualization version GIF version |
Description: Eliminate an antecedent implied by each side of a biconditional. (Contributed by NM, 21-May-1999.) |
Ref | Expression |
---|---|
pm5.21ni.1 | ⊢ (𝜑 → 𝜓) |
pm5.21ni.2 | ⊢ (𝜒 → 𝜓) |
pm5.21nii.3 | ⊢ (𝜓 → (𝜑 ↔ 𝜒)) |
Ref | Expression |
---|---|
pm5.21nii | ⊢ (𝜑 ↔ 𝜒) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | pm5.21nii.3 | . 2 ⊢ (𝜓 → (𝜑 ↔ 𝜒)) | |
2 | pm5.21ni.1 | . . 3 ⊢ (𝜑 → 𝜓) | |
3 | pm5.21ni.2 | . . 3 ⊢ (𝜒 → 𝜓) | |
4 | 2, 3 | pm5.21ni 381 | . 2 ⊢ (¬ 𝜓 → (𝜑 ↔ 𝜒)) |
5 | 1, 4 | pm2.61i 184 | 1 ⊢ (𝜑 ↔ 𝜒) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ↔ wb 208 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 |
This theorem depends on definitions: df-bi 209 |
This theorem is referenced by: elrabf 3675 elrab 3679 sbccow 3794 sbcco 3797 sbc5 3799 sbcan 3820 sbcor 3821 sbcal 3832 sbcex2 3833 sbcel1v 3838 sbcel1vOLD 3839 sbcreu 3858 eldif 3945 elun 4124 elin 4168 sbccsb2 4385 2reu4 4465 elpr2 4584 eluni 4834 eliun 4915 sbcbr123 5112 elopab 5406 opelopabsb 5409 opeliunxp2 5703 inisegn0 5955 brfvopabrbr 6759 elpwun 7485 elxp5 7622 opeliunxp2f 7870 tpostpos 7906 ecdmn0 8330 brecop2 8385 elixpsn 8495 bren 8512 elharval 9021 sdom2en01 9718 isfin1-2 9801 wdomac 9943 elwina 10102 elina 10103 lterpq 10386 ltrnq 10395 elnp 10403 elnpi 10404 ltresr 10556 eluz2 12243 dfle2 12534 dflt2 12535 rexanuz2 14703 even2n 15685 isstruct2 16487 xpsfrnel2 16831 ismre 16855 isacs 16916 brssc 17078 isfunc 17128 oduclatb 17748 isipodrs 17765 issubg 18273 isnsg 18301 oppgsubm 18484 oppgsubg 18485 isslw 18727 efgrelexlema 18869 dvdsr 19390 isunit 19401 isirred 19443 issubrg 19529 opprsubrg 19550 islss 19700 islbs4 20970 istopon 21514 basdif0 21555 dis2ndc 22062 elmptrab 22429 isusp 22864 ismet2 22937 isphtpc 23592 elpi1 23643 iscmet 23881 bcthlem1 23921 wlkcpr 27404 isvcOLD 28350 isnv 28383 hlimi 28959 h1de2ci 29327 elunop 29643 ispcmp 31116 elmpps 32815 eldm3 32992 opelco3 33013 elima4 33014 elno 33148 brsset 33345 brbigcup 33354 elfix2 33360 elsingles 33374 imageval 33386 funpartlem 33398 elaltxp 33431 ellines 33608 isfne4 33683 bj-ismoore 34391 bj-idreseqb 34449 istotbnd 35041 isbnd 35052 isdrngo1 35228 isnacs 39294 sbccomieg 39383 elmnc 39729 ismea 42727 |
Copyright terms: Public domain | W3C validator |