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Mirrors > Home > ILE Home > Th. List > 3bitr4d | GIF version |
Description: Deduction from transitivity of biconditional. Useful for converting conditional definitions in a formula. (Contributed by NM, 18-Oct-1995.) |
Ref | Expression |
---|---|
3bitr4d.1 | ⊢ (𝜑 → (𝜓 ↔ 𝜒)) |
3bitr4d.2 | ⊢ (𝜑 → (𝜃 ↔ 𝜓)) |
3bitr4d.3 | ⊢ (𝜑 → (𝜏 ↔ 𝜒)) |
Ref | Expression |
---|---|
3bitr4d | ⊢ (𝜑 → (𝜃 ↔ 𝜏)) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | 3bitr4d.2 | . 2 ⊢ (𝜑 → (𝜃 ↔ 𝜓)) | |
2 | 3bitr4d.1 | . . 3 ⊢ (𝜑 → (𝜓 ↔ 𝜒)) | |
3 | 3bitr4d.3 | . . 3 ⊢ (𝜑 → (𝜏 ↔ 𝜒)) | |
4 | 2, 3 | bitr4d 189 | . 2 ⊢ (𝜑 → (𝜓 ↔ 𝜏)) |
5 | 1, 4 | bitrd 186 | 1 ⊢ (𝜑 → (𝜃 ↔ 𝜏)) |
Colors of variables: wff set class |
Syntax hints: → wi 4 ↔ wb 103 |
This theorem was proved from axioms: ax-1 5 ax-2 6 ax-mp 7 ax-ia1 104 ax-ia2 105 ax-ia3 106 |
This theorem depends on definitions: df-bi 115 |
This theorem is referenced by: dfbi3dc 1328 xordidc 1330 19.32dc 1609 r19.32vdc 2503 opbrop 4437 fvopab3g 5266 respreima 5316 fmptco 5351 cocan1 5447 cocan2 5448 brtposg 5892 nnmword 6114 swoer 6157 erth 6173 brecop 6219 ecopovsymg 6228 xpdom2 6328 pitric 6511 ltexpi 6527 ltapig 6528 ltmpig 6529 ltanqg 6590 ltmnqg 6591 enq0breq 6626 genpassl 6714 genpassu 6715 1idprl 6780 1idpru 6781 caucvgprlemcanl 6834 ltasrg 6947 prsrlt 6963 caucvgsrlemoffcau 6974 axpre-ltadd 7052 subsub23 7313 leadd1 7534 lemul1 7693 reapmul1lem 7694 reapmul1 7695 reapadd1 7696 apsym 7706 apadd1 7708 apti 7722 lediv1 7947 lt2mul2div 7957 lerec 7962 ltdiv2 7965 lediv2 7969 le2msq 7979 avgle1 8271 avgle2 8272 nn01to3 8702 qapne 8724 cnref1o 8733 xleneg 8904 iooneg 9010 iccneg 9011 iccshftr 9016 iccshftl 9018 iccdil 9020 icccntr 9022 fzsplit2 9069 fzaddel 9077 fzrev 9101 elfzo 9159 fzon 9175 elfzom1b 9238 ioo0 9268 ico0 9270 ioc0 9271 flqlt 9285 negqmod0 9333 expeq0 9507 nn0opthlem1d 9647 cjreb 9753 abs00 9950 ltmininf 10116 nndivdvds 10201 moddvds 10204 modmulconst 10227 oddm1even 10274 ltoddhalfle 10293 dvdssq 10420 |
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