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Mirrors > Home > ILE Home > Th. List > dcbid | GIF version |
Description: Equivalence property for decidability. Deduction form. (Contributed by Jim Kingdon, 7-Sep-2019.) |
Ref | Expression |
---|---|
dcbid.1 | ⊢ (𝜑 → (𝜓 ↔ 𝜒)) |
Ref | Expression |
---|---|
dcbid | ⊢ (𝜑 → (DECID 𝜓 ↔ DECID 𝜒)) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | dcbid.1 | . . 3 ⊢ (𝜑 → (𝜓 ↔ 𝜒)) | |
2 | 1 | notbid 656 | . . 3 ⊢ (𝜑 → (¬ 𝜓 ↔ ¬ 𝜒)) |
3 | 1, 2 | orbi12d 782 | . 2 ⊢ (𝜑 → ((𝜓 ∨ ¬ 𝜓) ↔ (𝜒 ∨ ¬ 𝜒))) |
4 | df-dc 820 | . 2 ⊢ (DECID 𝜓 ↔ (𝜓 ∨ ¬ 𝜓)) | |
5 | df-dc 820 | . 2 ⊢ (DECID 𝜒 ↔ (𝜒 ∨ ¬ 𝜒)) | |
6 | 3, 4, 5 | 3bitr4g 222 | 1 ⊢ (𝜑 → (DECID 𝜓 ↔ DECID 𝜒)) |
Colors of variables: wff set class |
Syntax hints: ¬ wn 3 → wi 4 ↔ wb 104 ∨ wo 697 DECID wdc 819 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 105 ax-ia2 106 ax-ia3 107 ax-in1 603 ax-in2 604 ax-io 698 |
This theorem depends on definitions: df-bi 116 df-dc 820 |
This theorem is referenced by: dcbiit 824 exmidexmid 4115 exmidel 4123 dcdifsnid 6393 finexdc 6789 undifdcss 6804 ssfirab 6815 fidcenumlemrks 6834 difinfsnlem 6977 difinfsn 6978 ctssdclemn0 6988 ctssdccl 6989 ctssdclemr 6990 ctssdc 6991 ltdcpi 7124 enqdc 7162 enqdc1 7163 ltdcnq 7198 fzodcel 9922 exfzdc 10010 sumeq1 11117 sumdc 11120 summodclem2 11144 summodc 11145 zsumdc 11146 fsum3 11149 isumz 11151 isumss 11153 fisumss 11154 isumss2 11155 fsum3cvg2 11156 fsumsersdc 11157 fsumsplit 11169 prodeq1f 11314 dvdsdc 11490 zdvdsdc 11503 zsupcllemstep 11627 infssuzex 11631 hashdvds 11886 ennnfonelemr 11925 ennnfonelemim 11926 ctinf 11932 ctiunctlemudc 11939 ctiunct 11942 sumdc2 12995 nninfsellemdc 13195 |
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