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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 |
| This proof depends on syntax axioms: → wi 4 ∧ wa 104 ↔ wb 105 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia2 107 ax-ia3 108 |
| This proof depends on definitions: df-bi 117 |
| This theorem is used by: biadanid 622 eqrdav 2237 funfvbrb 5822 f1ocnv2d 6294 f1o3d 6298 funimass4f 6359 1stconst 6457 2ndconst 6458 cnvf1o 6461 ersymb 6821 swoer 6835 erth 6853 pw2f1odclem 7134 enen1 7140 enen2 7141 domen1 7142 domen2 7143 xpmapenlem 7149 fidifsnen 7172 fundmfibi 7252 f1dmvrnfibi 7258 2omap 7318 2omapfi 7320 ordiso2 7375 omniwomnimkv 7507 enwomnilem 7509 nninfwlpoimlemginf 7516 pw1if 7584 exmidapne 7626 infregelbex 10007 fzsplit2 10465 fzsplit3 10468 fseq1p1m1 10511 elfz2nn0 10529 infssfzcldc 10679 infssfzledc 10680 btwnzge0 10748 modqsubdir 10843 zesq 11109 hashprg 11263 sseqn 11293 hashfibclem 11296 rereb 11642 abslt 11869 absle 11870 maxleastb 11995 maxltsup 11999 xrltmaxsup 12039 xrmaxltsup 12040 iserex 12121 mptfzshft 12225 fsumrev 12226 fprodrev 12402 dvdsadd2b 12623 nn0ob 12691 bitsfzo 12738 dfgcd3 12803 dfgcd2 12807 dvdsmulgcd 12818 lcmgcdeq 12877 isprm5 12937 nnmaxpwlemparts 12968 qden1elz 13001 ballotfilemsf1o 13306 issubmnd 13804 mhmf1o 13826 subsubm 13839 resmhm2b 13845 grpinvid1 13906 grpinvid2 13907 subsubg 14049 ssnmz 14063 ghmf1 14125 kerf1ghm 14126 ghmf1o 14127 conjnmzb 14132 0unit 14485 rhmf1o 14524 subsubrng 14571 subrgunit 14596 subsubrg 14602 ringunitap 14642 drngunitap 14657 islss3 14765 islss4 14768 ellspsn6 14794 lspsneq0b 14813 dflidl2rng 14867 issubassa 15062 issubassa2 15084 cncnp 15380 xmetxpbl 15658 dedekindicc 15783 coseq0q4123 15985 coseq0negpitopi 15987 relogeftb 16016 relogbcxpbap 16120 upgr2wlkdc 16716 pw1map 17123 pwf1oexmid 17127 isomninnlem 17177 apdiff 17195 iswomninnlem 17197 ismkvnnlem 17200 redcwlpolemeq1 17202 |
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