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Mirrors > Home > ILE Home > Th. List > syl6ibr | GIF version |
Description: A mixed syllogism inference from a nested implication and a biconditional. Useful for substituting an embedded consequent with a definition. (Contributed by NM, 5-Aug-1993.) |
Ref | Expression |
---|---|
syl6ibr.1 | ⊢ (𝜑 → (𝜓 → 𝜒)) |
syl6ibr.2 | ⊢ (𝜃 ↔ 𝜒) |
Ref | Expression |
---|---|
syl6ibr | ⊢ (𝜑 → (𝜓 → 𝜃)) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | syl6ibr.1 | . 2 ⊢ (𝜑 → (𝜓 → 𝜒)) | |
2 | syl6ibr.2 | . . 3 ⊢ (𝜃 ↔ 𝜒) | |
3 | 2 | biimpri 132 | . 2 ⊢ (𝜒 → 𝜃) |
4 | 1, 3 | syl6 33 | 1 ⊢ (𝜑 → (𝜓 → 𝜃)) |
Colors of variables: wff set class |
Syntax hints: → wi 4 ↔ wb 104 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 105 ax-ia2 106 ax-ia3 107 |
This theorem depends on definitions: df-bi 116 |
This theorem is referenced by: 3imtr4g 204 imp4a 347 dcbi 921 oplem1 960 3impexpbicom 1415 hband 1466 hb3and 1467 nfand 1548 nfimd 1565 equsexd 1708 euim 2068 mopick2 2083 2moswapdc 2090 necon3bd 2352 necon3d 2353 necon2ad 2366 necon1abiddc 2371 ralrimd 2513 rspcimedv 2795 2reuswapdc 2892 ra5 3001 difin 3318 r19.2m 3454 r19.2mOLD 3455 tpid3g 3646 sssnm 3689 ssiun 3863 ssiun2 3864 disjnim 3928 exmidsssnc 4134 sotricim 4253 sotritrieq 4255 tron 4312 ordsucss 4428 ordunisuc2r 4438 ordpwsucss 4490 dmcosseq 4818 relssres 4865 trin2 4938 ssrnres 4989 fnun 5237 f1oun 5395 ssimaex 5490 chfnrn 5539 dffo4 5576 dffo5 5577 isoselem 5729 fnoprabg 5880 poxp 6137 issmo2 6194 smores 6197 tfr0dm 6227 tfrlemibxssdm 6232 tfr1onlembxssdm 6248 tfrcllembxssdm 6261 swoer 6465 qsss 6496 findcard 6790 findcard2 6791 findcard2s 6792 supmoti 6888 ctmlemr 7001 ctm 7002 pm54.43 7063 indpi 7174 recexprlemm 7456 recexprlemloc 7463 recexprlem1ssl 7465 recexprlem1ssu 7466 recexprlemss1l 7467 recexprlemss1u 7468 zmulcl 9131 indstr 9415 eluzdc 9431 icoshft 9803 fzouzsplit 9987 hashunlem 10582 modfsummod 11259 dvds2lem 11541 oddnn02np1 11613 dfgcd2 11738 sqrt2irr 11876 ennnfonelemhom 11964 omctfn 11992 distop 12293 epttop 12298 restdis 12392 cnrest2 12444 cnptopresti 12446 uptx 12482 txcn 12483 logbgcd1irr 13092 decidr 13174 bj-omssind 13304 bj-om 13306 bj-inf2vnlem3 13341 bj-inf2vnlem4 13342 |
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