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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 9998 fzsplit2 10455 fzsplit3 10458 fseq1p1m1 10501 elfz2nn0 10519 infssfzcldc 10669 infssfzledc 10670 btwnzge0 10735 modqsubdir 10830 zesq 11096 hashprg 11249 sseqn 11279 hashfibclem 11282 rereb 11628 abslt 11854 absle 11855 maxleastb 11980 maxltsup 11984 xrltmaxsup 12023 xrmaxltsup 12024 iserex 12105 mptfzshft 12209 fsumrev 12210 fprodrev 12386 dvdsadd2b 12607 nn0ob 12675 bitsfzo 12722 dfgcd3 12787 dfgcd2 12791 dvdsmulgcd 12802 lcmgcdeq 12861 isprm5 12920 qden1elz 12983 ballotfilemsf1o 13257 issubmnd 13755 mhmf1o 13777 subsubm 13790 resmhm2b 13796 grpinvid1 13857 grpinvid2 13858 subsubg 14000 ssnmz 14014 ghmf1 14076 kerf1ghm 14077 ghmf1o 14078 conjnmzb 14083 0unit 14436 rhmf1o 14475 subsubrng 14522 subrgunit 14547 subsubrg 14553 ringunitap 14593 drngunitap 14608 islss3 14716 islss4 14719 ellspsn6 14745 lspsneq0b 14764 dflidl2rng 14818 issubassa 15013 issubassa2 15035 cncnp 15331 xmetxpbl 15609 dedekindicc 15734 coseq0q4123 15935 coseq0negpitopi 15937 relogeftb 15966 relogbcxpbap 16067 upgr2wlkdc 16618 pw1map 17025 pwf1oexmid 17029 isomninnlem 17079 apdiff 17097 iswomninnlem 17099 ismkvnnlem 17102 redcwlpolemeq1 17104 |
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