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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: eqrdav 2176 funfvbrb 5626 f1ocnv2d 6070 1stconst 6217 2ndconst 6218 cnvf1o 6221 ersymb 6544 swoer 6558 erth 6574 enen1 6835 enen2 6836 domen1 6837 domen2 6838 xpmapenlem 6844 fidifsnen 6865 fundmfibi 6933 f1dmvrnfibi 6938 ordiso2 7029 omniwomnimkv 7160 enwomnilem 7162 nninfwlpoimlemginf 7169 exmidapne 7254 infregelbex 9592 fzsplit2 10043 fseq1p1m1 10087 elfz2nn0 10105 btwnzge0 10293 modqsubdir 10386 zesq 10631 hashprg 10779 rereb 10863 abslt 11088 absle 11089 maxleastb 11214 maxltsup 11218 xrltmaxsup 11256 xrmaxltsup 11257 iserex 11338 mptfzshft 11441 fsumrev 11442 fprodrev 11618 dvdsadd2b 11838 nn0ob 11903 dfgcd3 12001 dfgcd2 12005 dvdsmulgcd 12016 lcmgcdeq 12073 isprm5 12132 qden1elz 12195 issubmnd 12773 mhmf1o 12789 grpinvid1 12852 grpinvid2 12853 subsubg 12983 0unit 13197 cncnp 13512 xmetxpbl 13790 dedekindicc 13893 coseq0q4123 14037 coseq0negpitopi 14039 relogeftb 14068 relogbcxpbap 14165 pwf1oexmid 14520 isomninnlem 14549 apdiff 14567 iswomninnlem 14568 ismkvnnlem 14571 redcwlpolemeq1 14573 |
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