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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 10561 modqsubdir 10656 zesq 10921 hashprg 11073 rereb 11428 abslt 11653 absle 11654 maxleastb 11779 maxltsup 11783 xrltmaxsup 11822 xrmaxltsup 11823 iserex 11904 mptfzshft 12008 fsumrev 12009 fprodrev 12185 dvdsadd2b 12406 nn0ob 12474 bitsfzo 12521 dfgcd3 12586 dfgcd2 12590 dvdsmulgcd 12601 lcmgcdeq 12660 isprm5 12719 qden1elz 12782 issubmnd 13530 mhmf1o 13558 subsubm 13571 resmhm2b 13577 grpinvid1 13640 grpinvid2 13641 subsubg 13789 ssnmz 13803 ghmf1 13865 kerf1ghm 13866 ghmf1o 13867 conjnmzb 13872 0unit 14149 rhmf1o 14188 subsubrng 14234 subrgunit 14259 subsubrg 14265 islss3 14399 islss4 14402 lspsnel6 14428 lspsneq0b 14447 dflidl2rng 14501 cncnp 14960 xmetxpbl 15238 dedekindicc 15363 coseq0q4123 15564 coseq0negpitopi 15566 relogeftb 15595 relogbcxpbap 15695 upgr2wlkdc 16234 2omap 16620 pw1map 16622 pwf1oexmid 16626 isomninnlem 16660 apdiff 16678 iswomninnlem 16680 ismkvnnlem 16683 redcwlpolemeq1 16685 |
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