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| Mirrors > Home > ILE Home > Th. List > impbida | GIF version | ||
| Description: Deduce an equivalence from two implications. (Contributed by NM, 17-Feb-2007.) |
| Ref | Expression |
|---|---|
| impbida.1 | ⊢ ((𝜑 ∧ 𝜓) → 𝜒) |
| impbida.2 | ⊢ ((𝜑 ∧ 𝜒) → 𝜓) |
| Ref | Expression |
|---|---|
| impbida | ⊢ (𝜑 → (𝜓 ↔ 𝜒)) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | impbida.1 | . . 3 ⊢ ((𝜑 ∧ 𝜓) → 𝜒) | |
| 2 | 1 | ex 115 | . 2 ⊢ (𝜑 → (𝜓 → 𝜒)) |
| 3 | impbida.2 | . . 3 ⊢ ((𝜑 ∧ 𝜒) → 𝜓) | |
| 4 | 3 | ex 115 | . 2 ⊢ (𝜑 → (𝜒 → 𝜓)) |
| 5 | 2, 4 | impbid 129 | 1 ⊢ (𝜑 → (𝜓 ↔ 𝜒)) |
| Colors of variables: wff set class |
| Syntax hints: → wi 4 ∧ wa 104 ↔ wb 105 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia2 107 ax-ia3 108 |
| This theorem depends on definitions: df-bi 117 |
| This theorem is referenced by: biadanid 616 eqrdav 2228 funfvbrb 5750 f1ocnv2d 6216 1stconst 6373 2ndconst 6374 cnvf1o 6377 ersymb 6702 swoer 6716 erth 6734 pw2f1odclem 7003 enen1 7009 enen2 7010 domen1 7011 domen2 7012 xpmapenlem 7018 fidifsnen 7040 fundmfibi 7116 f1dmvrnfibi 7122 ordiso2 7213 omniwomnimkv 7345 enwomnilem 7347 nninfwlpoimlemginf 7354 pw1if 7421 exmidapne 7457 infregelbex 9805 fzsplit2 10258 fseq1p1m1 10302 elfz2nn0 10320 btwnzge0 10532 modqsubdir 10627 zesq 10892 hashprg 11043 rereb 11389 abslt 11614 absle 11615 maxleastb 11740 maxltsup 11744 xrltmaxsup 11783 xrmaxltsup 11784 iserex 11865 mptfzshft 11968 fsumrev 11969 fprodrev 12145 dvdsadd2b 12366 nn0ob 12434 bitsfzo 12481 dfgcd3 12546 dfgcd2 12550 dvdsmulgcd 12561 lcmgcdeq 12620 isprm5 12679 qden1elz 12742 issubmnd 13490 mhmf1o 13518 subsubm 13531 resmhm2b 13537 grpinvid1 13600 grpinvid2 13601 subsubg 13749 ssnmz 13763 ghmf1 13825 kerf1ghm 13826 ghmf1o 13827 conjnmzb 13832 0unit 14108 rhmf1o 14147 subsubrng 14193 subrgunit 14218 subsubrg 14224 islss3 14358 islss4 14361 lspsnel6 14387 lspsneq0b 14406 dflidl2rng 14460 cncnp 14919 xmetxpbl 15197 dedekindicc 15322 coseq0q4123 15523 coseq0negpitopi 15525 relogeftb 15554 relogbcxpbap 15654 upgr2wlkdc 16116 2omap 16418 pw1map 16420 pwf1oexmid 16424 isomninnlem 16458 apdiff 16476 iswomninnlem 16477 ismkvnnlem 16480 redcwlpolemeq1 16482 |
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