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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 616 eqrdav 2228 funfvbrb 5756 f1ocnv2d 6222 1stconst 6381 2ndconst 6382 cnvf1o 6385 ersymb 6711 swoer 6725 erth 6743 pw2f1odclem 7015 enen1 7021 enen2 7022 domen1 7023 domen2 7024 xpmapenlem 7030 fidifsnen 7052 fundmfibi 7128 f1dmvrnfibi 7134 ordiso2 7225 omniwomnimkv 7357 enwomnilem 7359 nninfwlpoimlemginf 7366 pw1if 7433 exmidapne 7469 infregelbex 9822 fzsplit2 10275 fseq1p1m1 10319 elfz2nn0 10337 btwnzge0 10550 modqsubdir 10645 zesq 10910 hashprg 11062 rereb 11414 abslt 11639 absle 11640 maxleastb 11765 maxltsup 11769 xrltmaxsup 11808 xrmaxltsup 11809 iserex 11890 mptfzshft 11993 fsumrev 11994 fprodrev 12170 dvdsadd2b 12391 nn0ob 12459 bitsfzo 12506 dfgcd3 12571 dfgcd2 12575 dvdsmulgcd 12586 lcmgcdeq 12645 isprm5 12704 qden1elz 12767 issubmnd 13515 mhmf1o 13543 subsubm 13556 resmhm2b 13562 grpinvid1 13625 grpinvid2 13626 subsubg 13774 ssnmz 13788 ghmf1 13850 kerf1ghm 13851 ghmf1o 13852 conjnmzb 13857 0unit 14133 rhmf1o 14172 subsubrng 14218 subrgunit 14243 subsubrg 14249 islss3 14383 islss4 14386 lspsnel6 14412 lspsneq0b 14431 dflidl2rng 14485 cncnp 14944 xmetxpbl 15222 dedekindicc 15347 coseq0q4123 15548 coseq0negpitopi 15550 relogeftb 15579 relogbcxpbap 15679 upgr2wlkdc 16172 2omap 16530 pw1map 16532 pwf1oexmid 16536 isomninnlem 16570 apdiff 16588 iswomninnlem 16589 ismkvnnlem 16592 redcwlpolemeq1 16594 |
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