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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 5769 f1ocnv2d 6237 1stconst 6395 2ndconst 6396 cnvf1o 6399 ersymb 6759 swoer 6773 erth 6791 pw2f1odclem 7063 enen1 7069 enen2 7070 domen1 7071 domen2 7072 xpmapenlem 7078 fidifsnen 7100 fundmfibi 7180 f1dmvrnfibi 7186 ordiso2 7277 omniwomnimkv 7409 enwomnilem 7411 nninfwlpoimlemginf 7418 pw1if 7486 exmidapne 7522 infregelbex 9876 fzsplit2 10330 fseq1p1m1 10374 elfz2nn0 10392 btwnzge0 10606 modqsubdir 10701 zesq 10966 hashprg 11118 rereb 11486 abslt 11711 absle 11712 maxleastb 11837 maxltsup 11841 xrltmaxsup 11880 xrmaxltsup 11881 iserex 11962 mptfzshft 12066 fsumrev 12067 fprodrev 12243 dvdsadd2b 12464 nn0ob 12532 bitsfzo 12579 dfgcd3 12644 dfgcd2 12648 dvdsmulgcd 12659 lcmgcdeq 12718 isprm5 12777 qden1elz 12840 issubmnd 13588 mhmf1o 13616 subsubm 13629 resmhm2b 13635 grpinvid1 13698 grpinvid2 13699 subsubg 13847 ssnmz 13861 ghmf1 13923 kerf1ghm 13924 ghmf1o 13925 conjnmzb 13930 0unit 14207 rhmf1o 14246 subsubrng 14292 subrgunit 14317 subsubrg 14323 islss3 14458 islss4 14461 lspsnel6 14487 lspsneq0b 14506 dflidl2rng 14560 cncnp 15024 xmetxpbl 15302 dedekindicc 15427 coseq0q4123 15628 coseq0negpitopi 15630 relogeftb 15659 relogbcxpbap 15759 upgr2wlkdc 16301 2omap 16698 pw1map 16700 pwf1oexmid 16704 isomninnlem 16745 apdiff 16763 iswomninnlem 16765 ismkvnnlem 16768 redcwlpolemeq1 16770 |
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