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| Mirrors > Home > ILE Home > Th. List > frec2uz0d | GIF version | ||
| Description: The mapping 𝐺 is a one-to-one mapping from ω onto upper integers that will be used to construct a recursive definition generator. Ordinal natural number 0 maps to complex number 𝐶 (normally 0 for the upper integers ℕ0 or 1 for the upper integers ℕ), 1 maps to 𝐶 + 1, etc. This theorem shows the value of 𝐺 at ordinal natural number zero. (Contributed by Jim Kingdon, 16-May-2020.) |
| Ref | Expression |
|---|---|
| frec2uz.1 | ⊢ (𝜑 → 𝐶 ∈ ℤ) |
| frec2uz.2 | ⊢ 𝐺 = frec((𝑥 ∈ ℤ ↦ (𝑥 + 1)), 𝐶) |
| Ref | Expression |
|---|---|
| frec2uz0d | ⊢ (𝜑 → (𝐺‘∅) = 𝐶) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | frec2uz.2 | . . 3 ⊢ 𝐺 = frec((𝑥 ∈ ℤ ↦ (𝑥 + 1)), 𝐶) | |
| 2 | 1 | fveq1i 5577 | . 2 ⊢ (𝐺‘∅) = (frec((𝑥 ∈ ℤ ↦ (𝑥 + 1)), 𝐶)‘∅) |
| 3 | frec2uz.1 | . . 3 ⊢ (𝜑 → 𝐶 ∈ ℤ) | |
| 4 | frec0g 6483 | . . 3 ⊢ (𝐶 ∈ ℤ → (frec((𝑥 ∈ ℤ ↦ (𝑥 + 1)), 𝐶)‘∅) = 𝐶) | |
| 5 | 3, 4 | syl 14 | . 2 ⊢ (𝜑 → (frec((𝑥 ∈ ℤ ↦ (𝑥 + 1)), 𝐶)‘∅) = 𝐶) |
| 6 | 2, 5 | eqtrid 2250 | 1 ⊢ (𝜑 → (𝐺‘∅) = 𝐶) |
| Colors of variables: wff set class |
| Syntax hints: → wi 4 = wceq 1373 ∈ wcel 2176 ∅c0 3460 ↦ cmpt 4105 ‘cfv 5271 (class class class)co 5944 freccfrec 6476 1c1 7926 + caddc 7928 ℤcz 9372 |
| 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 615 ax-in2 616 ax-io 711 ax-5 1470 ax-7 1471 ax-gen 1472 ax-ie1 1516 ax-ie2 1517 ax-8 1527 ax-10 1528 ax-11 1529 ax-i12 1530 ax-bndl 1532 ax-4 1533 ax-17 1549 ax-i9 1553 ax-ial 1557 ax-i5r 1558 ax-13 2178 ax-14 2179 ax-ext 2187 ax-sep 4162 ax-nul 4170 ax-pow 4218 ax-pr 4253 ax-un 4480 ax-setind 4585 |
| This theorem depends on definitions: df-bi 117 df-3an 983 df-tru 1376 df-fal 1379 df-nf 1484 df-sb 1786 df-eu 2057 df-mo 2058 df-clab 2192 df-cleq 2198 df-clel 2201 df-nfc 2337 df-ne 2377 df-ral 2489 df-rex 2490 df-rab 2493 df-v 2774 df-sbc 2999 df-csb 3094 df-dif 3168 df-un 3170 df-in 3172 df-ss 3179 df-nul 3461 df-pw 3618 df-sn 3639 df-pr 3640 df-op 3642 df-uni 3851 df-int 3886 df-iun 3929 df-br 4045 df-opab 4106 df-mpt 4107 df-tr 4143 df-id 4340 df-iord 4413 df-on 4415 df-suc 4418 df-iom 4639 df-xp 4681 df-rel 4682 df-cnv 4683 df-co 4684 df-dm 4685 df-res 4687 df-iota 5232 df-fun 5273 df-fn 5274 df-fv 5279 df-recs 6391 df-frec 6477 |
| This theorem is referenced by: frec2uzuzd 10547 frec2uzrand 10550 frec2uzrdg 10554 frecuzrdgg 10561 frecfzennn 10571 0tonninf 10585 1tonninf 10586 omgadd 10947 ennnfonelem1 12778 ennnfonelemhf1o 12784 012of 15930 2o01f 15931 isomninnlem 15969 iswomninnlem 15988 ismkvnnlem 15991 |
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