Theorem algfx 12193

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 5693	. . . 4 ⊢ (𝐴 ∈ 𝑆 → (𝐶‘𝐴) ∈ ℕ0)
4	1, 3	eqeltrid 2280	. . 3 ⊢ (𝐴 ∈ 𝑆 → 𝑁 ∈ ℕ0)
5	4	nn0zd 9440	. 2 ⊢ (𝐴 ∈ 𝑆 → 𝑁 ∈ ℤ)
6		uzval 9597	. . . . . . 7 ⊢ (𝑁 ∈ ℤ → (ℤ≥‘𝑁) = {𝑧 ∈ ℤ ∣ 𝑁 ≤ 𝑧})
7	6	eleq2d 2263	. . . . . 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 5564	. . . . . . 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 5564	. . . . . . 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 5564	. . . . . . 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 5564	. . . . . . 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 2194	. . . . . . 7 ⊢ (𝐴 ∈ 𝑆 → (𝑅‘𝑁) = (𝑅‘𝑁))
18	17	a1i 9	. . . . . 6 ⊢ (𝑁 ∈ ℤ → (𝐴 ∈ 𝑆 → (𝑅‘𝑁) = (𝑅‘𝑁)))
19	6	eleq2d 2263	. . . . . . . . 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 9667	. . . . . . . . . . . . . . 15 ⊢ ((𝑁 ∈ ℕ0 ∧ 𝑘 ∈ (ℤ≥‘𝑁)) → 𝑘 ∈ ℕ0)
22	4, 21	sylan 283	. . . . . . . . . . . . . 14 ⊢ ((𝐴 ∈ 𝑆 ∧ 𝑘 ∈ (ℤ≥‘𝑁)) → 𝑘 ∈ ℕ0)
23		nn0uz 9630	. . . . . . . . . . . . . . 15 ⊢ ℕ0 = (ℤ≥‘0)
24		algcvga.2	. . . . . . . . . . . . . . 15 ⊢ 𝑅 = seq0((𝐹 ∘ 1st ), (ℕ0 × {𝐴}))
25		0zd 9332	. . . . . . . . . . . . . . 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 12187	. . . . . . . . . . . . . 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 12186	. . . . . . . . . . . . . . . 16 ⊢ (𝐴 ∈ 𝑆 → 𝑅:ℕ0⟶𝑆)
32	31	ffvelcdmda 5694	. . . . . . . . . . . . . . 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 12192	. . . . . . . . . . . . . . 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 5564	. . . . . . . . . . . . . . . 16 ⊢ (𝑧 = (𝑅‘𝑘) → ((𝐶‘𝑧) = 0 ↔ (𝐶‘(𝑅‘𝑘)) = 0))
38		fveq2 5555	. . . . . . . . . . . . . . . . 17 ⊢ (𝑧 = (𝑅‘𝑘) → (𝐹‘𝑧) = (𝐹‘(𝑅‘𝑘)))
39		id 19	. . . . . . . . . . . . . . . . 17 ⊢ (𝑧 = (𝑅‘𝑘) → 𝑧 = (𝑅‘𝑘))
40	38, 39	eqeq12d 2208	. . . . . . . . . . . . . . . 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 2827	. . . . . . . . . . . . . 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 2226	. . . . . . . . . . . 12 ⊢ ((𝐴 ∈ 𝑆 ∧ 𝑘 ∈ (ℤ≥‘𝑁)) → (𝑅‘(𝑘 + 1)) = (𝑅‘𝑘))
46	45	eqeq1d 2202	. . . . . . . . . . 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 9433	. . . . 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 1364   ∈ wcel 2164   ≠ wne 2364  {crab 2476  {csn 3619   class class class wbr 4030   × cxp 4658   ∘ ccom 4664  ⟶wf 5251  ‘cfv 5255  (class class class)co 5919  1^st c1st 6193  0cc0 7874  1c1 7875   + caddc 7877   < clt 8056   ≤ cle 8057  ℕ₀cn0 9243  ℤcz 9320  ℤ_≥cuz 9595  seqcseq 10521

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 710  ax-5 1458  ax-7 1459  ax-gen 1460  ax-ie1 1504  ax-ie2 1505  ax-8 1515  ax-10 1516  ax-11 1517  ax-i12 1518  ax-bndl 1520  ax-4 1521  ax-17 1537  ax-i9 1541  ax-ial 1545  ax-i5r 1546  ax-13 2166  ax-14 2167  ax-ext 2175  ax-coll 4145  ax-sep 4148  ax-nul 4156  ax-pow 4204  ax-pr 4239  ax-un 4465  ax-setind 4570  ax-iinf 4621  ax-cnex 7965  ax-resscn 7966  ax-1cn 7967  ax-1re 7968  ax-icn 7969  ax-addcl 7970  ax-addrcl 7971  ax-mulcl 7972  ax-addcom 7974  ax-addass 7976  ax-distr 7978  ax-i2m1 7979  ax-0lt1 7980  ax-0id 7982  ax-rnegex 7983  ax-cnre 7985  ax-pre-ltirr 7986  ax-pre-ltwlin 7987  ax-pre-lttrn 7988  ax-pre-apti 7989  ax-pre-ltadd 7990

This theorem depends on definitions:  df-bi 117  df-stab 832  df-dc 836  df-3or 981  df-3an 982  df-tru 1367  df-fal 1370  df-nf 1472  df-sb 1774  df-eu 2045  df-mo 2046  df-clab 2180  df-cleq 2186  df-clel 2189  df-nfc 2325  df-ne 2365  df-nel 2460  df-ral 2477  df-rex 2478  df-reu 2479  df-rab 2481  df-v 2762  df-sbc 2987  df-csb 3082  df-dif 3156  df-un 3158  df-in 3160  df-ss 3167  df-nul 3448  df-pw 3604  df-sn 3625  df-pr 3626  df-op 3628  df-uni 3837  df-int 3872  df-iun 3915  df-br 4031  df-opab 4092  df-mpt 4093  df-tr 4129  df-id 4325  df-iord 4398  df-on 4400  df-ilim 4401  df-suc 4403  df-iom 4624  df-xp 4666  df-rel 4667  df-cnv 4668  df-co 4669  df-dm 4670  df-rn 4671  df-res 4672  df-ima 4673  df-iota 5216  df-fun 5257  df-fn 5258  df-f 5259  df-f1 5260  df-fo 5261  df-f1o 5262  df-fv 5263  df-riota 5874  df-ov 5922  df-oprab 5923  df-mpo 5924  df-1st 6195  df-2nd 6196  df-recs 6360  df-frec 6446  df-pnf 8058  df-mnf 8059  df-xr 8060  df-ltxr 8061  df-le 8062  df-sub 8194  df-neg 8195  df-inn 8985  df-n0 9244  df-z 9321  df-uz 9596  df-seqfrec 10522

This theorem is referenced by: (None)