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Mirrors > Home > ILE Home > Th. List > frec2uzuzd | GIF version |
Description: The value 𝐺 (see frec2uz0d 9401) at an ordinal natural number is in the upper integers. (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 |
---|---|
frec2uzuzd | ⊢ (𝜑 → (𝐺‘𝐴) ∈ (ℤ≥‘𝐶)) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | frec2uzzd.a | . 2 ⊢ (𝜑 → 𝐴 ∈ ω) | |
2 | simpr 108 | . . . . 5 ⊢ ((𝜑 ∧ 𝑦 = 𝐴) → 𝑦 = 𝐴) | |
3 | 2 | eleq1d 2147 | . . . 4 ⊢ ((𝜑 ∧ 𝑦 = 𝐴) → (𝑦 ∈ ω ↔ 𝐴 ∈ ω)) |
4 | 2 | fveq2d 5202 | . . . . 5 ⊢ ((𝜑 ∧ 𝑦 = 𝐴) → (𝐺‘𝑦) = (𝐺‘𝐴)) |
5 | 4 | eleq1d 2147 | . . . 4 ⊢ ((𝜑 ∧ 𝑦 = 𝐴) → ((𝐺‘𝑦) ∈ (ℤ≥‘𝐶) ↔ (𝐺‘𝐴) ∈ (ℤ≥‘𝐶))) |
6 | 3, 5 | imbi12d 232 | . . 3 ⊢ ((𝜑 ∧ 𝑦 = 𝐴) → ((𝑦 ∈ ω → (𝐺‘𝑦) ∈ (ℤ≥‘𝐶)) ↔ (𝐴 ∈ ω → (𝐺‘𝐴) ∈ (ℤ≥‘𝐶)))) |
7 | fveq2 5198 | . . . . . 6 ⊢ (𝑦 = ∅ → (𝐺‘𝑦) = (𝐺‘∅)) | |
8 | 7 | eleq1d 2147 | . . . . 5 ⊢ (𝑦 = ∅ → ((𝐺‘𝑦) ∈ (ℤ≥‘𝐶) ↔ (𝐺‘∅) ∈ (ℤ≥‘𝐶))) |
9 | fveq2 5198 | . . . . . 6 ⊢ (𝑦 = 𝑧 → (𝐺‘𝑦) = (𝐺‘𝑧)) | |
10 | 9 | eleq1d 2147 | . . . . 5 ⊢ (𝑦 = 𝑧 → ((𝐺‘𝑦) ∈ (ℤ≥‘𝐶) ↔ (𝐺‘𝑧) ∈ (ℤ≥‘𝐶))) |
11 | fveq2 5198 | . . . . . 6 ⊢ (𝑦 = suc 𝑧 → (𝐺‘𝑦) = (𝐺‘suc 𝑧)) | |
12 | 11 | eleq1d 2147 | . . . . 5 ⊢ (𝑦 = suc 𝑧 → ((𝐺‘𝑦) ∈ (ℤ≥‘𝐶) ↔ (𝐺‘suc 𝑧) ∈ (ℤ≥‘𝐶))) |
13 | frec2uz.1 | . . . . . . 7 ⊢ (𝜑 → 𝐶 ∈ ℤ) | |
14 | frec2uz.2 | . . . . . . 7 ⊢ 𝐺 = frec((𝑥 ∈ ℤ ↦ (𝑥 + 1)), 𝐶) | |
15 | 13, 14 | frec2uz0d 9401 | . . . . . 6 ⊢ (𝜑 → (𝐺‘∅) = 𝐶) |
16 | uzid 8633 | . . . . . . 7 ⊢ (𝐶 ∈ ℤ → 𝐶 ∈ (ℤ≥‘𝐶)) | |
17 | 13, 16 | syl 14 | . . . . . 6 ⊢ (𝜑 → 𝐶 ∈ (ℤ≥‘𝐶)) |
18 | 15, 17 | eqeltrd 2155 | . . . . 5 ⊢ (𝜑 → (𝐺‘∅) ∈ (ℤ≥‘𝐶)) |
19 | peano2uz 8671 | . . . . . . 7 ⊢ ((𝐺‘𝑧) ∈ (ℤ≥‘𝐶) → ((𝐺‘𝑧) + 1) ∈ (ℤ≥‘𝐶)) | |
20 | 13 | adantl 271 | . . . . . . . . 9 ⊢ ((𝑧 ∈ ω ∧ 𝜑) → 𝐶 ∈ ℤ) |
21 | simpl 107 | . . . . . . . . 9 ⊢ ((𝑧 ∈ ω ∧ 𝜑) → 𝑧 ∈ ω) | |
22 | 20, 14, 21 | frec2uzsucd 9403 | . . . . . . . 8 ⊢ ((𝑧 ∈ ω ∧ 𝜑) → (𝐺‘suc 𝑧) = ((𝐺‘𝑧) + 1)) |
23 | 22 | eleq1d 2147 | . . . . . . 7 ⊢ ((𝑧 ∈ ω ∧ 𝜑) → ((𝐺‘suc 𝑧) ∈ (ℤ≥‘𝐶) ↔ ((𝐺‘𝑧) + 1) ∈ (ℤ≥‘𝐶))) |
24 | 19, 23 | syl5ibr 154 | . . . . . 6 ⊢ ((𝑧 ∈ ω ∧ 𝜑) → ((𝐺‘𝑧) ∈ (ℤ≥‘𝐶) → (𝐺‘suc 𝑧) ∈ (ℤ≥‘𝐶))) |
25 | 24 | ex 113 | . . . . 5 ⊢ (𝑧 ∈ ω → (𝜑 → ((𝐺‘𝑧) ∈ (ℤ≥‘𝐶) → (𝐺‘suc 𝑧) ∈ (ℤ≥‘𝐶)))) |
26 | 8, 10, 12, 18, 25 | finds2 4342 | . . . 4 ⊢ (𝑦 ∈ ω → (𝜑 → (𝐺‘𝑦) ∈ (ℤ≥‘𝐶))) |
27 | 26 | com12 30 | . . 3 ⊢ (𝜑 → (𝑦 ∈ ω → (𝐺‘𝑦) ∈ (ℤ≥‘𝐶))) |
28 | 1, 6, 27 | vtocld 2651 | . 2 ⊢ (𝜑 → (𝐴 ∈ ω → (𝐺‘𝐴) ∈ (ℤ≥‘𝐶))) |
29 | 1, 28 | mpd 13 | 1 ⊢ (𝜑 → (𝐺‘𝐴) ∈ (ℤ≥‘𝐶)) |
Colors of variables: wff set class |
Syntax hints: → wi 4 ∧ wa 102 = wceq 1284 ∈ wcel 1433 ∅c0 3251 ↦ cmpt 3839 suc csuc 4120 ωcom 4331 ‘cfv 4922 (class class class)co 5532 freccfrec 6000 1c1 6982 + caddc 6984 ℤcz 8351 ℤ≥cuz 8619 |
This theorem was proved from axioms: ax-1 5 ax-2 6 ax-mp 7 ax-ia1 104 ax-ia2 105 ax-ia3 106 ax-in1 576 ax-in2 577 ax-io 662 ax-5 1376 ax-7 1377 ax-gen 1378 ax-ie1 1422 ax-ie2 1423 ax-8 1435 ax-10 1436 ax-11 1437 ax-i12 1438 ax-bndl 1439 ax-4 1440 ax-13 1444 ax-14 1445 ax-17 1459 ax-i9 1463 ax-ial 1467 ax-i5r 1468 ax-ext 2063 ax-coll 3893 ax-sep 3896 ax-nul 3904 ax-pow 3948 ax-pr 3964 ax-un 4188 ax-setind 4280 ax-iinf 4329 ax-cnex 7067 ax-resscn 7068 ax-1cn 7069 ax-1re 7070 ax-icn 7071 ax-addcl 7072 ax-addrcl 7073 ax-mulcl 7074 ax-addcom 7076 ax-addass 7078 ax-distr 7080 ax-i2m1 7081 ax-0lt1 7082 ax-0id 7084 ax-rnegex 7085 ax-cnre 7087 ax-pre-ltirr 7088 ax-pre-ltwlin 7089 ax-pre-lttrn 7090 ax-pre-ltadd 7092 |
This theorem depends on definitions: df-bi 115 df-3or 920 df-3an 921 df-tru 1287 df-fal 1290 df-nf 1390 df-sb 1686 df-eu 1944 df-mo 1945 df-clab 2068 df-cleq 2074 df-clel 2077 df-nfc 2208 df-ne 2246 df-nel 2340 df-ral 2353 df-rex 2354 df-reu 2355 df-rab 2357 df-v 2603 df-sbc 2816 df-csb 2909 df-dif 2975 df-un 2977 df-in 2979 df-ss 2986 df-nul 3252 df-pw 3384 df-sn 3404 df-pr 3405 df-op 3407 df-uni 3602 df-int 3637 df-iun 3680 df-br 3786 df-opab 3840 df-mpt 3841 df-tr 3876 df-id 4048 df-iord 4121 df-on 4123 df-suc 4126 df-iom 4332 df-xp 4369 df-rel 4370 df-cnv 4371 df-co 4372 df-dm 4373 df-rn 4374 df-res 4375 df-ima 4376 df-iota 4887 df-fun 4924 df-fn 4925 df-f 4926 df-f1 4927 df-fo 4928 df-f1o 4929 df-fv 4930 df-riota 5488 df-ov 5535 df-oprab 5536 df-mpt2 5537 df-recs 5943 df-frec 6001 df-pnf 7155 df-mnf 7156 df-xr 7157 df-ltxr 7158 df-le 7159 df-sub 7281 df-neg 7282 df-inn 8040 df-n0 8289 df-z 8352 df-uz 8620 |
This theorem is referenced by: frec2uzltd 9405 frec2uzrand 9407 frec2uzrdg 9411 frecuzrdgsuc 9417 |
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