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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 7319 2omapfi 7321 ordiso2 7376 omniwomnimkv 7508 enwomnilem 7510 nninfwlpoimlemginf 7517 pw1if 7585 exmidapne 7627 infregelbex 10008 fzsplit2 10466 fzsplit3 10469 fseq1p1m1 10512 elfz2nn0 10530 infssfzcldc 10680 infssfzledc 10681 btwnzge0 10750 modqsubdir 10845 zesq 11111 hashprg 11265 sseqn 11295 hashfibclem 11298 rereb 11644 abslt 11871 absle 11872 maxleastb 11997 maxltsup 12001 xrltmaxsup 12042 xrmaxltsup 12043 iserex 12124 mptfzshft 12228 fsumrev 12229 fprodrev 12405 dvdsadd2b 12626 nn0ob 12694 bitsfzo 12741 dfgcd3 12806 dfgcd2 12810 dvdsmulgcd 12821 lcmgcdeq 12880 isprm5 12940 nnmaxpwlemparts 12971 qden1elz 13004 ballotfilemsf1o 13309 issubmnd 13808 mhmf1o 13830 subsubm 13843 resmhm2b 13849 grpinvid1 13910 grpinvid2 13911 subsubg 14053 ssnmz 14067 ghmf1 14129 kerf1ghm 14130 ghmf1o 14131 conjnmzb 14136 0unit 14520 rhmf1o 14559 subsubrng 14606 subrgunit 14631 subsubrg 14637 ringunitap 14677 drngunitap 14692 islss3 14800 islss4 14803 ellspsn6 14829 lspsneq0b 14848 dflidl2rng 14902 issubassa 15097 issubassa2 15119 psrbaglefifi 15147 cncnp 15422 xmetxpbl 15700 dedekindicc 15825 coseq0q4123 16027 coseq0negpitopi 16029 relogeftb 16058 relogbcxpbap 16162 upgr2wlkdc 16784 pw1map 17191 pwf1oexmid 17195 isomninnlem 17245 apdiff 17264 iswomninnlem 17266 ismkvnnlem 17269 redcwlpolemeq1 17271 |
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