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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 2231 funfvbrb 5791 f1ocnv2d 6259 1stconst 6417 2ndconst 6418 cnvf1o 6421 ersymb 6781 swoer 6795 erth 6813 pw2f1odclem 7087 enen1 7093 enen2 7094 domen1 7095 domen2 7096 xpmapenlem 7102 fidifsnen 7125 fundmfibi 7205 f1dmvrnfibi 7211 2omap 7269 2omapfi 7271 ordiso2 7326 omniwomnimkv 7458 enwomnilem 7460 nninfwlpoimlemginf 7467 pw1if 7535 exmidapne 7574 infregelbex 9930 fzsplit2 10384 fseq1p1m1 10428 elfz2nn0 10446 btwnzge0 10660 modqsubdir 10755 zesq 11020 hashprg 11173 sseqn 11203 hashfibclem 11206 rereb 11548 abslt 11773 absle 11774 maxleastb 11899 maxltsup 11903 xrltmaxsup 11942 xrmaxltsup 11943 iserex 12024 mptfzshft 12128 fsumrev 12129 fprodrev 12305 dvdsadd2b 12526 nn0ob 12594 bitsfzo 12641 dfgcd3 12706 dfgcd2 12710 dvdsmulgcd 12721 lcmgcdeq 12780 isprm5 12839 qden1elz 12902 issubmnd 13655 mhmf1o 13683 subsubm 13696 resmhm2b 13702 grpinvid1 13765 grpinvid2 13766 subsubg 13914 ssnmz 13928 ghmf1 13990 kerf1ghm 13991 ghmf1o 13992 conjnmzb 13997 0unit 14274 rhmf1o 14313 subsubrng 14359 subrgunit 14384 subsubrg 14390 islss3 14527 islss4 14530 lspsnel6 14556 lspsneq0b 14575 dflidl2rng 14629 cncnp 15095 xmetxpbl 15373 dedekindicc 15498 coseq0q4123 15699 coseq0negpitopi 15701 relogeftb 15730 relogbcxpbap 15830 upgr2wlkdc 16372 pw1map 16769 pwf1oexmid 16773 isomninnlem 16814 apdiff 16832 iswomninnlem 16834 ismkvnnlem 16837 redcwlpolemeq1 16839 |
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