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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 618 eqrdav 2230 funfvbrb 5760 f1ocnv2d 6226 1stconst 6385 2ndconst 6386 cnvf1o 6389 ersymb 6715 swoer 6729 erth 6747 pw2f1odclem 7019 enen1 7025 enen2 7026 domen1 7027 domen2 7028 xpmapenlem 7034 fidifsnen 7056 fundmfibi 7136 f1dmvrnfibi 7142 ordiso2 7233 omniwomnimkv 7365 enwomnilem 7367 nninfwlpoimlemginf 7374 pw1if 7442 exmidapne 7478 infregelbex 9831 fzsplit2 10284 fseq1p1m1 10328 elfz2nn0 10346 btwnzge0 10559 modqsubdir 10654 zesq 10919 hashprg 11071 rereb 11423 abslt 11648 absle 11649 maxleastb 11774 maxltsup 11778 xrltmaxsup 11817 xrmaxltsup 11818 iserex 11899 mptfzshft 12002 fsumrev 12003 fprodrev 12179 dvdsadd2b 12400 nn0ob 12468 bitsfzo 12515 dfgcd3 12580 dfgcd2 12584 dvdsmulgcd 12595 lcmgcdeq 12654 isprm5 12713 qden1elz 12776 issubmnd 13524 mhmf1o 13552 subsubm 13565 resmhm2b 13571 grpinvid1 13634 grpinvid2 13635 subsubg 13783 ssnmz 13797 ghmf1 13859 kerf1ghm 13860 ghmf1o 13861 conjnmzb 13866 0unit 14142 rhmf1o 14181 subsubrng 14227 subrgunit 14252 subsubrg 14258 islss3 14392 islss4 14395 lspsnel6 14421 lspsneq0b 14440 dflidl2rng 14494 cncnp 14953 xmetxpbl 15231 dedekindicc 15356 coseq0q4123 15557 coseq0negpitopi 15559 relogeftb 15588 relogbcxpbap 15688 upgr2wlkdc 16227 2omap 16594 pw1map 16596 pwf1oexmid 16600 isomninnlem 16634 apdiff 16652 iswomninnlem 16653 ismkvnnlem 16656 redcwlpolemeq1 16658 |
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