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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 2233 funfvbrb 5796 f1ocnv2d 6267 f1o3d 6271 funimass4f 6332 1stconst 6430 2ndconst 6431 cnvf1o 6434 ersymb 6794 swoer 6808 erth 6826 pw2f1odclem 7100 enen1 7106 enen2 7107 domen1 7108 domen2 7109 xpmapenlem 7115 fidifsnen 7138 fundmfibi 7218 f1dmvrnfibi 7224 2omap 7282 2omapfi 7284 ordiso2 7339 omniwomnimkv 7471 enwomnilem 7473 nninfwlpoimlemginf 7480 pw1if 7548 exmidapne 7590 infregelbex 9948 fzsplit2 10404 fzsplit3 10407 fseq1p1m1 10450 elfz2nn0 10468 infssfzcldc 10618 infssfzledc 10619 btwnzge0 10684 modqsubdir 10779 zesq 11045 hashprg 11198 sseqn 11228 hashfibclem 11231 rereb 11573 abslt 11798 absle 11799 maxleastb 11924 maxltsup 11928 xrltmaxsup 11967 xrmaxltsup 11968 iserex 12049 mptfzshft 12153 fsumrev 12154 fprodrev 12330 dvdsadd2b 12551 nn0ob 12619 bitsfzo 12666 dfgcd3 12731 dfgcd2 12735 dvdsmulgcd 12746 lcmgcdeq 12805 isprm5 12864 qden1elz 12927 ballotfilemsf1o 13201 issubmnd 13703 mhmf1o 13725 subsubm 13738 resmhm2b 13744 grpinvid1 13807 grpinvid2 13808 subsubg 13950 ssnmz 13964 ghmf1 14026 kerf1ghm 14027 ghmf1o 14028 conjnmzb 14033 0unit 14374 rhmf1o 14413 subsubrng 14460 subrgunit 14485 subsubrg 14491 ringunitap 14531 drngunitap 14546 islss3 14653 islss4 14656 lspsnel6 14682 lspsneq0b 14701 dflidl2rng 14755 cncnp 15221 xmetxpbl 15499 dedekindicc 15624 coseq0q4123 15825 coseq0negpitopi 15827 relogeftb 15856 relogbcxpbap 15956 upgr2wlkdc 16498 pw1map 16895 pwf1oexmid 16899 isomninnlem 16940 apdiff 16958 iswomninnlem 16960 ismkvnnlem 16963 redcwlpolemeq1 16965 |
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