Theorem algfx 12374

Description: If 𝐹 reaches a fixed point when the countdown function 𝐶 reaches 0, 𝐹 remains fixed after 𝑁 steps. (Contributed by Paul Chapman, 22-Jun-2011.)

Hypotheses

Ref	Expression
algcvga.1	⊢ 𝐹:𝑆⟶𝑆
algcvga.2	⊢ 𝑅 = seq0((𝐹 ∘ 1st ), (ℕ0 × {𝐴}))
algcvga.3	⊢ 𝐶:𝑆⟶ℕ0
algcvga.4	⊢ (𝑧 ∈ 𝑆 → ((𝐶‘(𝐹‘𝑧)) ≠ 0 → (𝐶‘(𝐹‘𝑧)) < (𝐶‘𝑧)))
algcvga.5	⊢ 𝑁 = (𝐶‘𝐴)
algfx.6	⊢ (𝑧 ∈ 𝑆 → ((𝐶‘𝑧) = 0 → (𝐹‘𝑧) = 𝑧))

Assertion

Ref	Expression
algfx	⊢ (𝐴 ∈ 𝑆 → (𝐾 ∈ (ℤ≥‘𝑁) → (𝑅‘𝐾) = (𝑅‘𝑁)))

Distinct variable groups:   𝑧,𝐶   𝑧,𝐹   𝑧,𝑅   𝑧,𝑆   𝑧,𝐾   𝑧,𝑁

Allowed substitution hint:   𝐴(𝑧)

Proof of Theorem algfx

Dummy variables 𝑘 𝑚 are mutually distinct and distinct from all other variables.

Step	Hyp	Ref	Expression
1		algcvga.5	. . . 4 ⊢ 𝑁 = (𝐶‘𝐴)
2		algcvga.3	. . . . 5 ⊢ 𝐶:𝑆⟶ℕ0
3	2	ffvelcdmi 5714	. . . 4 ⊢ (𝐴 ∈ 𝑆 → (𝐶‘𝐴) ∈ ℕ0)
4	1, 3	eqeltrid 2292	. . 3 ⊢ (𝐴 ∈ 𝑆 → 𝑁 ∈ ℕ0)
5	4	nn0zd 9493	. 2 ⊢ (𝐴 ∈ 𝑆 → 𝑁 ∈ ℤ)
6		uzval 9650	. . . . . . 7 ⊢ (𝑁 ∈ ℤ → (ℤ≥‘𝑁) = {𝑧 ∈ ℤ ∣ 𝑁 ≤ 𝑧})
7	6	eleq2d 2275	. . . . . 6 ⊢ (𝑁 ∈ ℤ → (𝐾 ∈ (ℤ≥‘𝑁) ↔ 𝐾 ∈ {𝑧 ∈ ℤ ∣ 𝑁 ≤ 𝑧}))
8	7	pm5.32i 454	. . . . 5 ⊢ ((𝑁 ∈ ℤ ∧ 𝐾 ∈ (ℤ≥‘𝑁)) ↔ (𝑁 ∈ ℤ ∧ 𝐾 ∈ {𝑧 ∈ ℤ ∣ 𝑁 ≤ 𝑧}))
9		fveqeq2 5585	. . . . . . 7 ⊢ (𝑚 = 𝑁 → ((𝑅‘𝑚) = (𝑅‘𝑁) ↔ (𝑅‘𝑁) = (𝑅‘𝑁)))
10	9	imbi2d 230	. . . . . 6 ⊢ (𝑚 = 𝑁 → ((𝐴 ∈ 𝑆 → (𝑅‘𝑚) = (𝑅‘𝑁)) ↔ (𝐴 ∈ 𝑆 → (𝑅‘𝑁) = (𝑅‘𝑁))))
11		fveqeq2 5585	. . . . . . 7 ⊢ (𝑚 = 𝑘 → ((𝑅‘𝑚) = (𝑅‘𝑁) ↔ (𝑅‘𝑘) = (𝑅‘𝑁)))
12	11	imbi2d 230	. . . . . 6 ⊢ (𝑚 = 𝑘 → ((𝐴 ∈ 𝑆 → (𝑅‘𝑚) = (𝑅‘𝑁)) ↔ (𝐴 ∈ 𝑆 → (𝑅‘𝑘) = (𝑅‘𝑁))))
13		fveqeq2 5585	. . . . . . 7 ⊢ (𝑚 = (𝑘 + 1) → ((𝑅‘𝑚) = (𝑅‘𝑁) ↔ (𝑅‘(𝑘 + 1)) = (𝑅‘𝑁)))
14	13	imbi2d 230	. . . . . 6 ⊢ (𝑚 = (𝑘 + 1) → ((𝐴 ∈ 𝑆 → (𝑅‘𝑚) = (𝑅‘𝑁)) ↔ (𝐴 ∈ 𝑆 → (𝑅‘(𝑘 + 1)) = (𝑅‘𝑁))))
15		fveqeq2 5585	. . . . . . 7 ⊢ (𝑚 = 𝐾 → ((𝑅‘𝑚) = (𝑅‘𝑁) ↔ (𝑅‘𝐾) = (𝑅‘𝑁)))
16	15	imbi2d 230	. . . . . 6 ⊢ (𝑚 = 𝐾 → ((𝐴 ∈ 𝑆 → (𝑅‘𝑚) = (𝑅‘𝑁)) ↔ (𝐴 ∈ 𝑆 → (𝑅‘𝐾) = (𝑅‘𝑁))))
17		eqidd 2206	. . . . . . 7 ⊢ (𝐴 ∈ 𝑆 → (𝑅‘𝑁) = (𝑅‘𝑁))
18	17	a1i 9	. . . . . 6 ⊢ (𝑁 ∈ ℤ → (𝐴 ∈ 𝑆 → (𝑅‘𝑁) = (𝑅‘𝑁)))
19	6	eleq2d 2275	. . . . . . . . 9 ⊢ (𝑁 ∈ ℤ → (𝑘 ∈ (ℤ≥‘𝑁) ↔ 𝑘 ∈ {𝑧 ∈ ℤ ∣ 𝑁 ≤ 𝑧}))
20	19	pm5.32i 454	. . . . . . . 8 ⊢ ((𝑁 ∈ ℤ ∧ 𝑘 ∈ (ℤ≥‘𝑁)) ↔ (𝑁 ∈ ℤ ∧ 𝑘 ∈ {𝑧 ∈ ℤ ∣ 𝑁 ≤ 𝑧}))
21		eluznn0 9720	. . . . . . . . . . . . . . 15 ⊢ ((𝑁 ∈ ℕ0 ∧ 𝑘 ∈ (ℤ≥‘𝑁)) → 𝑘 ∈ ℕ0)
22	4, 21	sylan 283	. . . . . . . . . . . . . 14 ⊢ ((𝐴 ∈ 𝑆 ∧ 𝑘 ∈ (ℤ≥‘𝑁)) → 𝑘 ∈ ℕ0)
23		nn0uz 9683	. . . . . . . . . . . . . . 15 ⊢ ℕ0 = (ℤ≥‘0)
24		algcvga.2	. . . . . . . . . . . . . . 15 ⊢ 𝑅 = seq0((𝐹 ∘ 1st ), (ℕ0 × {𝐴}))
25		0zd 9384	. . . . . . . . . . . . . . 15 ⊢ (𝐴 ∈ 𝑆 → 0 ∈ ℤ)
26		id 19	. . . . . . . . . . . . . . 15 ⊢ (𝐴 ∈ 𝑆 → 𝐴 ∈ 𝑆)
27		algcvga.1	. . . . . . . . . . . . . . . 16 ⊢ 𝐹:𝑆⟶𝑆
28	27	a1i 9	. . . . . . . . . . . . . . 15 ⊢ (𝐴 ∈ 𝑆 → 𝐹:𝑆⟶𝑆)
29	23, 24, 25, 26, 28	algrp1 12368	. . . . . . . . . . . . . 14 ⊢ ((𝐴 ∈ 𝑆 ∧ 𝑘 ∈ ℕ0) → (𝑅‘(𝑘 + 1)) = (𝐹‘(𝑅‘𝑘)))
30	22, 29	syldan 282	. . . . . . . . . . . . 13 ⊢ ((𝐴 ∈ 𝑆 ∧ 𝑘 ∈ (ℤ≥‘𝑁)) → (𝑅‘(𝑘 + 1)) = (𝐹‘(𝑅‘𝑘)))
31	23, 24, 25, 26, 28	algrf 12367	. . . . . . . . . . . . . . . 16 ⊢ (𝐴 ∈ 𝑆 → 𝑅:ℕ0⟶𝑆)
32	31	ffvelcdmda 5715	. . . . . . . . . . . . . . 15 ⊢ ((𝐴 ∈ 𝑆 ∧ 𝑘 ∈ ℕ0) → (𝑅‘𝑘) ∈ 𝑆)
33	22, 32	syldan 282	. . . . . . . . . . . . . 14 ⊢ ((𝐴 ∈ 𝑆 ∧ 𝑘 ∈ (ℤ≥‘𝑁)) → (𝑅‘𝑘) ∈ 𝑆)
34		algcvga.4	. . . . . . . . . . . . . . . 16 ⊢ (𝑧 ∈ 𝑆 → ((𝐶‘(𝐹‘𝑧)) ≠ 0 → (𝐶‘(𝐹‘𝑧)) < (𝐶‘𝑧)))
35	27, 24, 2, 34, 1	algcvga 12373	. . . . . . . . . . . . . . 15 ⊢ (𝐴 ∈ 𝑆 → (𝑘 ∈ (ℤ≥‘𝑁) → (𝐶‘(𝑅‘𝑘)) = 0))
36	35	imp 124	. . . . . . . . . . . . . 14 ⊢ ((𝐴 ∈ 𝑆 ∧ 𝑘 ∈ (ℤ≥‘𝑁)) → (𝐶‘(𝑅‘𝑘)) = 0)
37		fveqeq2 5585	. . . . . . . . . . . . . . . 16 ⊢ (𝑧 = (𝑅‘𝑘) → ((𝐶‘𝑧) = 0 ↔ (𝐶‘(𝑅‘𝑘)) = 0))
38		fveq2 5576	. . . . . . . . . . . . . . . . 17 ⊢ (𝑧 = (𝑅‘𝑘) → (𝐹‘𝑧) = (𝐹‘(𝑅‘𝑘)))
39		id 19	. . . . . . . . . . . . . . . . 17 ⊢ (𝑧 = (𝑅‘𝑘) → 𝑧 = (𝑅‘𝑘))
40	38, 39	eqeq12d 2220	. . . . . . . . . . . . . . . 16 ⊢ (𝑧 = (𝑅‘𝑘) → ((𝐹‘𝑧) = 𝑧 ↔ (𝐹‘(𝑅‘𝑘)) = (𝑅‘𝑘)))
41	37, 40	imbi12d 234	. . . . . . . . . . . . . . 15 ⊢ (𝑧 = (𝑅‘𝑘) → (((𝐶‘𝑧) = 0 → (𝐹‘𝑧) = 𝑧) ↔ ((𝐶‘(𝑅‘𝑘)) = 0 → (𝐹‘(𝑅‘𝑘)) = (𝑅‘𝑘))))
42		algfx.6	. . . . . . . . . . . . . . 15 ⊢ (𝑧 ∈ 𝑆 → ((𝐶‘𝑧) = 0 → (𝐹‘𝑧) = 𝑧))
43	41, 42	vtoclga 2839	. . . . . . . . . . . . . 14 ⊢ ((𝑅‘𝑘) ∈ 𝑆 → ((𝐶‘(𝑅‘𝑘)) = 0 → (𝐹‘(𝑅‘𝑘)) = (𝑅‘𝑘)))
44	33, 36, 43	sylc 62	. . . . . . . . . . . . 13 ⊢ ((𝐴 ∈ 𝑆 ∧ 𝑘 ∈ (ℤ≥‘𝑁)) → (𝐹‘(𝑅‘𝑘)) = (𝑅‘𝑘))
45	30, 44	eqtrd 2238	. . . . . . . . . . . 12 ⊢ ((𝐴 ∈ 𝑆 ∧ 𝑘 ∈ (ℤ≥‘𝑁)) → (𝑅‘(𝑘 + 1)) = (𝑅‘𝑘))
46	45	eqeq1d 2214	. . . . . . . . . . 11 ⊢ ((𝐴 ∈ 𝑆 ∧ 𝑘 ∈ (ℤ≥‘𝑁)) → ((𝑅‘(𝑘 + 1)) = (𝑅‘𝑁) ↔ (𝑅‘𝑘) = (𝑅‘𝑁)))
47	46	biimprd 158	. . . . . . . . . 10 ⊢ ((𝐴 ∈ 𝑆 ∧ 𝑘 ∈ (ℤ≥‘𝑁)) → ((𝑅‘𝑘) = (𝑅‘𝑁) → (𝑅‘(𝑘 + 1)) = (𝑅‘𝑁)))
48	47	expcom 116	. . . . . . . . 9 ⊢ (𝑘 ∈ (ℤ≥‘𝑁) → (𝐴 ∈ 𝑆 → ((𝑅‘𝑘) = (𝑅‘𝑁) → (𝑅‘(𝑘 + 1)) = (𝑅‘𝑁))))
49	48	adantl 277	. . . . . . . 8 ⊢ ((𝑁 ∈ ℤ ∧ 𝑘 ∈ (ℤ≥‘𝑁)) → (𝐴 ∈ 𝑆 → ((𝑅‘𝑘) = (𝑅‘𝑁) → (𝑅‘(𝑘 + 1)) = (𝑅‘𝑁))))
50	20, 49	sylbir 135	. . . . . . 7 ⊢ ((𝑁 ∈ ℤ ∧ 𝑘 ∈ {𝑧 ∈ ℤ ∣ 𝑁 ≤ 𝑧}) → (𝐴 ∈ 𝑆 → ((𝑅‘𝑘) = (𝑅‘𝑁) → (𝑅‘(𝑘 + 1)) = (𝑅‘𝑁))))
51	50	a2d 26	. . . . . 6 ⊢ ((𝑁 ∈ ℤ ∧ 𝑘 ∈ {𝑧 ∈ ℤ ∣ 𝑁 ≤ 𝑧}) → ((𝐴 ∈ 𝑆 → (𝑅‘𝑘) = (𝑅‘𝑁)) → (𝐴 ∈ 𝑆 → (𝑅‘(𝑘 + 1)) = (𝑅‘𝑁))))
52	10, 12, 14, 16, 18, 51	uzind3 9486	. . . . 5 ⊢ ((𝑁 ∈ ℤ ∧ 𝐾 ∈ {𝑧 ∈ ℤ ∣ 𝑁 ≤ 𝑧}) → (𝐴 ∈ 𝑆 → (𝑅‘𝐾) = (𝑅‘𝑁)))
53	8, 52	sylbi 121	. . . 4 ⊢ ((𝑁 ∈ ℤ ∧ 𝐾 ∈ (ℤ≥‘𝑁)) → (𝐴 ∈ 𝑆 → (𝑅‘𝐾) = (𝑅‘𝑁)))
54	53	ex 115	. . 3 ⊢ (𝑁 ∈ ℤ → (𝐾 ∈ (ℤ≥‘𝑁) → (𝐴 ∈ 𝑆 → (𝑅‘𝐾) = (𝑅‘𝑁))))
55	54	com3r 79	. 2 ⊢ (𝐴 ∈ 𝑆 → (𝑁 ∈ ℤ → (𝐾 ∈ (ℤ≥‘𝑁) → (𝑅‘𝐾) = (𝑅‘𝑁))))
56	5, 55	mpd 13	1 ⊢ (𝐴 ∈ 𝑆 → (𝐾 ∈ (ℤ≥‘𝑁) → (𝑅‘𝐾) = (𝑅‘𝑁)))

Syntax hints:   → wi 4   ∧ wa 104   = wceq 1373   ∈ wcel 2176   ≠ wne 2376  {crab 2488  {csn 3633   class class class wbr 4044   × cxp 4673   ∘ ccom 4679  ⟶wf 5267  ‘cfv 5271  (class class class)co 5944  1^st c1st 6224  0cc0 7925  1c1 7926   + caddc 7928   < clt 8107   ≤ cle 8108  ℕ₀cn0 9295  ℤcz 9372  ℤ_≥cuz 9648  seqcseq 10592

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-coll 4159  ax-sep 4162  ax-nul 4170  ax-pow 4218  ax-pr 4253  ax-un 4480  ax-setind 4585  ax-iinf 4636  ax-cnex 8016  ax-resscn 8017  ax-1cn 8018  ax-1re 8019  ax-icn 8020  ax-addcl 8021  ax-addrcl 8022  ax-mulcl 8023  ax-addcom 8025  ax-addass 8027  ax-distr 8029  ax-i2m1 8030  ax-0lt1 8031  ax-0id 8033  ax-rnegex 8034  ax-cnre 8036  ax-pre-ltirr 8037  ax-pre-ltwlin 8038  ax-pre-lttrn 8039  ax-pre-apti 8040  ax-pre-ltadd 8041

This theorem depends on definitions:  df-bi 117  df-stab 833  df-dc 837  df-3or 982  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-nel 2472  df-ral 2489  df-rex 2490  df-reu 2491  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-ilim 4416  df-suc 4418  df-iom 4639  df-xp 4681  df-rel 4682  df-cnv 4683  df-co 4684  df-dm 4685  df-rn 4686  df-res 4687  df-ima 4688  df-iota 5232  df-fun 5273  df-fn 5274  df-f 5275  df-f1 5276  df-fo 5277  df-f1o 5278  df-fv 5279  df-riota 5899  df-ov 5947  df-oprab 5948  df-mpo 5949  df-1st 6226  df-2nd 6227  df-recs 6391  df-frec 6477  df-pnf 8109  df-mnf 8110  df-xr 8111  df-ltxr 8112  df-le 8113  df-sub 8245  df-neg 8246  df-inn 9037  df-n0 9296  df-z 9373  df-uz 9649  df-seqfrec 10593

This theorem is referenced by: (None)