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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 3679 elrab 3683 sbccow 3798 sbcco 3801 sbc5 3803 sbcan 3824 sbcor 3825 sbcal 3836 sbcex2 3837 sbcel1v 3842 sbcel1vOLD 3843 sbcreu 3862 eldif 3949 elun 4128 elin 4172 sbccsb2 4389 2reu4 4469 elpr2 4594 eluni 4844 eliun 4926 sbcbr123 5123 elopab 5417 opelopabsb 5420 opeliunxp2 5712 inisegn0 5964 brfvopabrbr 6768 elpwun 7494 elxp5 7631 opeliunxp2f 7879 tpostpos 7915 ecdmn0 8339 brecop2 8394 elixpsn 8504 bren 8521 elharval 9030 sdom2en01 9727 isfin1-2 9810 wdomac 9952 elwina 10111 elina 10112 lterpq 10395 ltrnq 10404 elnp 10412 elnpi 10413 ltresr 10565 eluz2 12252 dfle2 12543 dflt2 12544 rexanuz2 14712 even2n 15694 isstruct2 16496 xpsfrnel2 16840 ismre 16864 isacs 16925 brssc 17087 isfunc 17137 oduclatb 17757 isipodrs 17774 issubg 18282 isnsg 18310 oppgsubm 18493 oppgsubg 18494 isslw 18736 efgrelexlema 18878 dvdsr 19399 isunit 19410 isirred 19452 issubrg 19538 opprsubrg 19559 islss 19709 islbs4 20979 istopon 21523 basdif0 21564 dis2ndc 22071 elmptrab 22438 isusp 22873 ismet2 22946 isphtpc 23601 elpi1 23652 iscmet 23890 bcthlem1 23930 wlkcpr 27413 isvcOLD 28359 isnv 28392 hlimi 28968 h1de2ci 29336 elunop 29652 ispcmp 31125 elmpps 32824 eldm3 33001 opelco3 33022 elima4 33023 elno 33157 brsset 33354 brbigcup 33363 elfix2 33369 elsingles 33383 imageval 33395 funpartlem 33407 elaltxp 33440 ellines 33617 isfne4 33692 bj-ismoore 34401 bj-idreseqb 34459 istotbnd 35051 isbnd 35062 isdrngo1 35238 isnacs 39307 sbccomieg 39396 elmnc 39742 ismea 42740 |
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