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 366 | . 2 ⊢ (¬ 𝜓 → (𝜑 ↔ 𝜒)) |
5 | 1, 4 | pm2.61i 175 | 1 ⊢ (𝜑 ↔ 𝜒) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ↔ wb 195 |
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 196 |
This theorem is referenced by: elrabf 3329 sbcco 3425 sbc5 3427 sbcan 3445 sbcor 3446 sbcal 3452 sbcex2 3453 sbcel1v 3462 sbcreu 3482 eldif 3550 elun 3715 elin 3758 sbccsb2 3957 elpr2 4147 eluni 4375 eliun 4460 sbcbr123 4636 elopab 4908 opelopabsb 4910 opeliunxp2 5182 inisegn0 5416 elpwun 6869 elxp5 7004 opeliunxp2f 7223 tpostpos 7259 ecdmn0 7676 brecop2 7728 elixpsn 7833 bren 7850 elharval 8351 sdom2en01 9007 isfin1-2 9090 wdomac 9230 elwina 9387 elina 9388 lterpq 9671 ltrnq 9680 elnp 9688 elnpi 9689 ltresr 9840 eluz2 11569 dfle2 11856 dflt2 11857 rexanuz2 13937 even2n 14904 isstruct2 15704 xpsfrnel2 16048 ismre 16073 isacs 16135 brssc 16297 isfunc 16347 oduclatb 16967 isipodrs 16984 issubg 17417 isnsg 17446 oppgsubm 17615 oppgsubg 17616 isslw 17846 efgrelexlema 17985 dvdsr 18469 isunit 18480 isirred 18522 issubrg 18603 opprsubrg 18624 islss 18756 islbs4 19990 istopon 20540 basdif0 20568 dis2ndc 21073 elmptrab 21440 isusp 21875 ismet2 21948 isphtpc 22601 elpi1 22653 iscmet 22890 bcthlem1 22929 isvcOLD 26818 isnv 26851 hlimi 27429 h1de2ci 27799 elunop 28115 ispcmp 29252 elmpps 30724 eldm3 30905 opelco3 30923 elima4 30924 elno 31043 brsset 31166 brbigcup 31175 elfix2 31181 elsingles 31195 imageval 31207 funpartlem 31219 elaltxp 31252 ellines 31429 isfne4 31505 istotbnd 32738 isbnd 32749 isdrngo1 32925 isnacs 36285 sbccomieg 36375 elmnc 36725 2reu4 39839 1wlkcpr 40833 isclwwlksng 41196 frgrusgrfrcond 41431 |
Copyright terms: Public domain | W3C validator |