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| Mirrors > Home > ILE Home > Th. List > ifcldadc | GIF version | ||
| Description: Conditional closure. (Contributed by Jim Kingdon, 11-Jan-2022.) |
| Ref | Expression |
|---|---|
| ifcldadc.1 | ⊢ ((𝜑 ∧ 𝜓) → 𝐴 ∈ 𝐶) |
| ifcldadc.2 | ⊢ ((𝜑 ∧ ¬ 𝜓) → 𝐵 ∈ 𝐶) |
| ifcldadc.dc | ⊢ (𝜑 → DECID 𝜓) |
| Ref | Expression |
|---|---|
| ifcldadc | ⊢ (𝜑 → if(𝜓, 𝐴, 𝐵) ∈ 𝐶) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | iftrue 3608 | . . . 4 ⊢ (𝜓 → if(𝜓, 𝐴, 𝐵) = 𝐴) | |
| 2 | 1 | adantl 277 | . . 3 ⊢ ((𝜑 ∧ 𝜓) → if(𝜓, 𝐴, 𝐵) = 𝐴) |
| 3 | ifcldadc.1 | . . 3 ⊢ ((𝜑 ∧ 𝜓) → 𝐴 ∈ 𝐶) | |
| 4 | 2, 3 | eqeltrd 2306 | . 2 ⊢ ((𝜑 ∧ 𝜓) → if(𝜓, 𝐴, 𝐵) ∈ 𝐶) |
| 5 | iffalse 3611 | . . . 4 ⊢ (¬ 𝜓 → if(𝜓, 𝐴, 𝐵) = 𝐵) | |
| 6 | 5 | adantl 277 | . . 3 ⊢ ((𝜑 ∧ ¬ 𝜓) → if(𝜓, 𝐴, 𝐵) = 𝐵) |
| 7 | ifcldadc.2 | . . 3 ⊢ ((𝜑 ∧ ¬ 𝜓) → 𝐵 ∈ 𝐶) | |
| 8 | 6, 7 | eqeltrd 2306 | . 2 ⊢ ((𝜑 ∧ ¬ 𝜓) → if(𝜓, 𝐴, 𝐵) ∈ 𝐶) |
| 9 | ifcldadc.dc | . . 3 ⊢ (𝜑 → DECID 𝜓) | |
| 10 | exmiddc 841 | . . 3 ⊢ (DECID 𝜓 → (𝜓 ∨ ¬ 𝜓)) | |
| 11 | 9, 10 | syl 14 | . 2 ⊢ (𝜑 → (𝜓 ∨ ¬ 𝜓)) |
| 12 | 4, 8, 11 | mpjaodan 803 | 1 ⊢ (𝜑 → if(𝜓, 𝐴, 𝐵) ∈ 𝐶) |
| Colors of variables: wff set class |
| Syntax hints: ¬ wn 3 → wi 4 ∧ wa 104 ∨ wo 713 DECID wdc 839 = wceq 1395 ∈ wcel 2200 ifcif 3603 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 106 ax-ia2 107 ax-ia3 108 ax-in2 618 ax-io 714 ax-5 1493 ax-7 1494 ax-gen 1495 ax-ie1 1539 ax-ie2 1540 ax-8 1550 ax-11 1552 ax-4 1556 ax-17 1572 ax-i9 1576 ax-ial 1580 ax-i5r 1581 ax-ext 2211 |
| This theorem depends on definitions: df-bi 117 df-dc 840 df-nf 1507 df-sb 1809 df-clab 2216 df-cleq 2222 df-clel 2225 df-if 3604 |
| This theorem is referenced by: updjudhf 7269 omp1eomlem 7284 difinfsnlem 7289 ctmlemr 7298 ctssdclemn0 7300 ctssdc 7303 enumctlemm 7304 xaddf 10069 xaddval 10070 iseqf1olemqcl 10751 iseqf1olemnab 10753 iseqf1olemjpcl 10760 iseqf1olemqpcl 10761 seq3f1oleml 10768 seq3f1o 10769 exp3val 10793 ccatcl 11160 swrdclg 11221 xrmaxiflemcl 11796 summodclem2a 11932 zsumdc 11935 fsum3 11938 isumss 11942 fsum3cvg2 11945 fsum3ser 11948 fsumcl2lem 11949 fsumadd 11957 sumsnf 11960 sumsplitdc 11983 fsummulc2 11999 isumlessdc 12047 cvgratz 12083 prodmodclem3 12126 prodmodclem2a 12127 zproddc 12130 fprodseq 12134 fprodmul 12142 prodsnf 12143 eucalgval2 12615 lcmval 12625 pcmpt 12906 ennnfonelemg 13014 mulgval 13699 mulgfng 13701 elplyd 15455 dvply1 15479 lgsval 15723 lgsfvalg 15724 lgsfcl2 15725 lgscllem 15726 lgsval2lem 15729 lgsdir 15754 lgsdilem2 15755 lgsdi 15756 lgsne0 15757 subctctexmid 16537 |
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