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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 622 eqrdav 2237 funfvbrb 5813 f1ocnv2d 6284 f1o3d 6288 funimass4f 6349 1stconst 6447 2ndconst 6448 cnvf1o 6451 ersymb 6811 swoer 6825 erth 6843 pw2f1odclem 7124 enen1 7130 enen2 7131 domen1 7132 domen2 7133 xpmapenlem 7139 fidifsnen 7162 fundmfibi 7242 f1dmvrnfibi 7248 2omap 7308 2omapfi 7310 ordiso2 7365 omniwomnimkv 7497 enwomnilem 7499 nninfwlpoimlemginf 7506 pw1if 7574 exmidapne 7616 infregelbex 9977 fzsplit2 10433 fzsplit3 10436 fseq1p1m1 10479 elfz2nn0 10497 infssfzcldc 10647 infssfzledc 10648 btwnzge0 10713 modqsubdir 10808 zesq 11074 hashprg 11227 sseqn 11257 hashfibclem 11260 rereb 11606 abslt 11832 absle 11833 maxleastb 11958 maxltsup 11962 xrltmaxsup 12001 xrmaxltsup 12002 iserex 12083 mptfzshft 12187 fsumrev 12188 fprodrev 12364 dvdsadd2b 12585 nn0ob 12653 bitsfzo 12700 dfgcd3 12765 dfgcd2 12769 dvdsmulgcd 12780 lcmgcdeq 12839 isprm5 12898 qden1elz 12961 ballotfilemsf1o 13235 issubmnd 13732 mhmf1o 13754 subsubm 13767 resmhm2b 13773 grpinvid1 13834 grpinvid2 13835 subsubg 13977 ssnmz 13991 ghmf1 14053 kerf1ghm 14054 ghmf1o 14055 conjnmzb 14060 0unit 14409 rhmf1o 14448 subsubrng 14495 subrgunit 14520 subsubrg 14526 ringunitap 14566 drngunitap 14581 islss3 14688 islss4 14691 lspsnel6 14717 lspsneq0b 14736 dflidl2rng 14790 cncnp 15254 xmetxpbl 15532 dedekindicc 15657 coseq0q4123 15858 coseq0negpitopi 15860 relogeftb 15889 relogbcxpbap 15990 upgr2wlkdc 16532 pw1map 16939 pwf1oexmid 16943 isomninnlem 16984 apdiff 17002 iswomninnlem 17004 ismkvnnlem 17007 redcwlpolemeq1 17009 |
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