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| Mirrors > Home > ILE Home > Th. List > frec2uzzd | GIF version | ||
| Description: The value of 𝐺 (see frec2uz0d 10629) is an integer. (Contributed by Jim Kingdon, 16-May-2020.) |
| Ref | Expression |
|---|---|
| frec2uz.1 | ⊢ (𝜑 → 𝐶 ∈ ℤ) |
| frec2uz.2 | ⊢ 𝐺 = frec((𝑥 ∈ ℤ ↦ (𝑥 + 1)), 𝐶) |
| frec2uzzd.a | ⊢ (𝜑 → 𝐴 ∈ ω) |
| Ref | Expression |
|---|---|
| frec2uzzd | ⊢ (𝜑 → (𝐺‘𝐴) ∈ ℤ) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | frec2uz.2 | . . 3 ⊢ 𝐺 = frec((𝑥 ∈ ℤ ↦ (𝑥 + 1)), 𝐶) | |
| 2 | 1 | fveq1i 5630 | . 2 ⊢ (𝐺‘𝐴) = (frec((𝑥 ∈ ℤ ↦ (𝑥 + 1)), 𝐶)‘𝐴) |
| 3 | frec2uz.1 | . . 3 ⊢ (𝜑 → 𝐶 ∈ ℤ) | |
| 4 | simpr 110 | . . . . 5 ⊢ ((𝜑 ∧ 𝑘 ∈ ℤ) → 𝑘 ∈ ℤ) | |
| 5 | 4 | peano2zd 9580 | . . . . 5 ⊢ ((𝜑 ∧ 𝑘 ∈ ℤ) → (𝑘 + 1) ∈ ℤ) |
| 6 | oveq1 6014 | . . . . . 6 ⊢ (𝑥 = 𝑘 → (𝑥 + 1) = (𝑘 + 1)) | |
| 7 | eqid 2229 | . . . . . 6 ⊢ (𝑥 ∈ ℤ ↦ (𝑥 + 1)) = (𝑥 ∈ ℤ ↦ (𝑥 + 1)) | |
| 8 | 6, 7 | fvmptg 5712 | . . . . 5 ⊢ ((𝑘 ∈ ℤ ∧ (𝑘 + 1) ∈ ℤ) → ((𝑥 ∈ ℤ ↦ (𝑥 + 1))‘𝑘) = (𝑘 + 1)) |
| 9 | 4, 5, 8 | syl2anc 411 | . . . 4 ⊢ ((𝜑 ∧ 𝑘 ∈ ℤ) → ((𝑥 ∈ ℤ ↦ (𝑥 + 1))‘𝑘) = (𝑘 + 1)) |
| 10 | 9, 5 | eqeltrd 2306 | . . 3 ⊢ ((𝜑 ∧ 𝑘 ∈ ℤ) → ((𝑥 ∈ ℤ ↦ (𝑥 + 1))‘𝑘) ∈ ℤ) |
| 11 | frec2uzzd.a | . . 3 ⊢ (𝜑 → 𝐴 ∈ ω) | |
| 12 | 3, 10, 11 | freccl 6555 | . 2 ⊢ (𝜑 → (frec((𝑥 ∈ ℤ ↦ (𝑥 + 1)), 𝐶)‘𝐴) ∈ ℤ) |
| 13 | 2, 12 | eqeltrid 2316 | 1 ⊢ (𝜑 → (𝐺‘𝐴) ∈ ℤ) |
| Colors of variables: wff set class |
| Syntax hints: → wi 4 ∧ wa 104 = wceq 1395 ∈ wcel 2200 ↦ cmpt 4145 ωcom 4682 ‘cfv 5318 (class class class)co 6007 freccfrec 6542 1c1 8008 + caddc 8010 ℤcz 9454 |
| 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-in1 617 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-10 1551 ax-11 1552 ax-i12 1553 ax-bndl 1555 ax-4 1556 ax-17 1572 ax-i9 1576 ax-ial 1580 ax-i5r 1581 ax-13 2202 ax-14 2203 ax-ext 2211 ax-coll 4199 ax-sep 4202 ax-nul 4210 ax-pow 4258 ax-pr 4293 ax-un 4524 ax-setind 4629 ax-iinf 4680 ax-cnex 8098 ax-resscn 8099 ax-1cn 8100 ax-1re 8101 ax-icn 8102 ax-addcl 8103 ax-addrcl 8104 ax-mulcl 8105 ax-addcom 8107 ax-addass 8109 ax-distr 8111 ax-i2m1 8112 ax-0id 8115 ax-rnegex 8116 ax-cnre 8118 |
| This theorem depends on definitions: df-bi 117 df-3or 1003 df-3an 1004 df-tru 1398 df-fal 1401 df-nf 1507 df-sb 1809 df-eu 2080 df-mo 2081 df-clab 2216 df-cleq 2222 df-clel 2225 df-nfc 2361 df-ne 2401 df-ral 2513 df-rex 2514 df-reu 2515 df-rab 2517 df-v 2801 df-sbc 3029 df-csb 3125 df-dif 3199 df-un 3201 df-in 3203 df-ss 3210 df-nul 3492 df-pw 3651 df-sn 3672 df-pr 3673 df-op 3675 df-uni 3889 df-int 3924 df-iun 3967 df-br 4084 df-opab 4146 df-mpt 4147 df-tr 4183 df-id 4384 df-iord 4457 df-on 4459 df-ilim 4460 df-suc 4462 df-iom 4683 df-xp 4725 df-rel 4726 df-cnv 4727 df-co 4728 df-dm 4729 df-rn 4730 df-res 4731 df-ima 4732 df-iota 5278 df-fun 5320 df-fn 5321 df-f 5322 df-f1 5323 df-fo 5324 df-f1o 5325 df-fv 5326 df-riota 5960 df-ov 6010 df-oprab 6011 df-mpo 6012 df-recs 6457 df-frec 6543 df-sub 8327 df-neg 8328 df-inn 9119 df-n0 9378 df-z 9455 |
| This theorem is referenced by: frec2uzsucd 10631 frec2uzltd 10633 frec2uzlt2d 10634 frec2uzf1od 10636 frec2uzrdg 10639 frec2uzled 10659 |
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