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| Mirrors > Home > ILE Home > Th. List > 3bitr3d | GIF version | ||
| Description: Deduction from transitivity of biconditional. Useful for converting conditional definitions in a formula. (Contributed by NM, 24-Apr-1996.) |
| Ref | Expression |
|---|---|
| 3bitr3d.1 | ⊢ (𝜑 → (𝜓 ↔ 𝜒)) |
| 3bitr3d.2 | ⊢ (𝜑 → (𝜓 ↔ 𝜃)) |
| 3bitr3d.3 | ⊢ (𝜑 → (𝜒 ↔ 𝜏)) |
| Ref | Expression |
|---|---|
| 3bitr3d | ⊢ (𝜑 → (𝜃 ↔ 𝜏)) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | 3bitr3d.2 | . . 3 ⊢ (𝜑 → (𝜓 ↔ 𝜃)) | |
| 2 | 3bitr3d.1 | . . 3 ⊢ (𝜑 → (𝜓 ↔ 𝜒)) | |
| 3 | 1, 2 | bitr3d 190 | . 2 ⊢ (𝜑 → (𝜃 ↔ 𝜒)) |
| 4 | 3bitr3d.3 | . 2 ⊢ (𝜑 → (𝜒 ↔ 𝜏)) | |
| 5 | 3, 4 | bitrd 188 | 1 ⊢ (𝜑 → (𝜃 ↔ 𝜏)) |
| Colors of variables: wff set class |
| Syntax hints: → wi 4 ↔ wb 105 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 106 ax-ia2 107 ax-ia3 108 |
| This theorem depends on definitions: df-bi 117 |
| This theorem is referenced by: csbcomg 3170 eloprabga 6169 ereldm 6846 mapen 7140 ordiso2 7369 subcan 8575 conjmulap 9053 ltrec 9207 divelunit 10387 fseq1m1p1 10485 fzm1 10490 qsqeqor 11070 fihashneq0 11216 hashfacen 11267 hashf1 11270 ccat0 11347 cvg1nlemcau 11733 lenegsq 11844 dvdsmod 12612 bitsmod 12706 bezoutlemle 12768 rpexp 12914 qnumdenbi 12953 eulerthlemh 12992 odzdvds 13007 pcelnn 13083 ballotfilemfc0 13215 ballotfilemfcc 13216 grpidpropdg 13677 sgrppropd 13711 mndpropd 13736 mhmpropd 13756 grppropd 13805 ghmnsgima 14054 cmnpropd 14081 qusecsub 14118 rngpropd 14237 ringpropd 14326 dvdsrpropdg 14437 resrhm2b 14540 opprdrng 14603 lmodprop2d 14668 lsspropdg 14751 zndvds0 14968 assapropd 14997 bdxmet 15585 txmetcnp 15602 cnmet 15614 birthdaylem3 16072 lgsne0 16140 lgsabs1 16141 gausslemma2dlem1a 16160 lgsquadlem2 16180 usgredg2v 16448 wlkeq 16578 eupth2lem3lem3fi 16694 eupth2lem3lem6fi 16695 |
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