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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 618 eqrdav 2230 funfvbrb 5760 f1ocnv2d 6227 1stconst 6386 2ndconst 6387 cnvf1o 6390 ersymb 6716 swoer 6730 erth 6748 pw2f1odclem 7020 enen1 7026 enen2 7027 domen1 7028 domen2 7029 xpmapenlem 7035 fidifsnen 7057 fundmfibi 7137 f1dmvrnfibi 7143 ordiso2 7234 omniwomnimkv 7366 enwomnilem 7368 nninfwlpoimlemginf 7375 pw1if 7443 exmidapne 7479 infregelbex 9832 fzsplit2 10285 fseq1p1m1 10329 elfz2nn0 10347 btwnzge0 10560 modqsubdir 10655 zesq 10920 hashprg 11072 rereb 11424 abslt 11649 absle 11650 maxleastb 11775 maxltsup 11779 xrltmaxsup 11818 xrmaxltsup 11819 iserex 11900 mptfzshft 12004 fsumrev 12005 fprodrev 12181 dvdsadd2b 12402 nn0ob 12470 bitsfzo 12517 dfgcd3 12582 dfgcd2 12586 dvdsmulgcd 12597 lcmgcdeq 12656 isprm5 12715 qden1elz 12778 issubmnd 13526 mhmf1o 13554 subsubm 13567 resmhm2b 13573 grpinvid1 13636 grpinvid2 13637 subsubg 13785 ssnmz 13799 ghmf1 13861 kerf1ghm 13862 ghmf1o 13863 conjnmzb 13868 0unit 14145 rhmf1o 14184 subsubrng 14230 subrgunit 14255 subsubrg 14261 islss3 14395 islss4 14398 lspsnel6 14424 lspsneq0b 14443 dflidl2rng 14497 cncnp 14956 xmetxpbl 15234 dedekindicc 15359 coseq0q4123 15560 coseq0negpitopi 15562 relogeftb 15591 relogbcxpbap 15691 upgr2wlkdc 16230 2omap 16597 pw1map 16599 pwf1oexmid 16603 isomninnlem 16637 apdiff 16655 iswomninnlem 16656 ismkvnnlem 16659 redcwlpolemeq1 16661 |
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