Theorem alginv 15288

Description: If 𝐼 is an invariant of 𝐹, its value is unchanged after any number of iterations of 𝐹. (Contributed by Paul Chapman, 31-Mar-2011.)

Hypotheses

Ref	Expression
alginv.1	⊢ 𝑅 = seq0((𝐹 ∘ 1st ), (ℕ0 × {𝐴}))
alginv.2	⊢ 𝐹:𝑆⟶𝑆
alginv.3	⊢ 𝐼 Fn 𝑆
alginv.4	⊢ (𝑥 ∈ 𝑆 → (𝐼‘(𝐹‘𝑥)) = (𝐼‘𝑥))

Assertion

Ref	Expression
alginv	⊢ ((𝐴 ∈ 𝑆 ∧ 𝐾 ∈ ℕ0) → (𝐼‘(𝑅‘𝐾)) = (𝐼‘(𝑅‘0)))

Distinct variable groups:   𝑥,𝐹   𝑥,𝐼   𝑥,𝑅   𝑥,𝑆

Allowed substitution hints:   𝐴(𝑥)   𝐾(𝑥)

Proof of Theorem alginv

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

Step	Hyp	Ref	Expression
1		fveq2 6191	. . . . . 6 ⊢ (𝑧 = 0 → (𝑅‘𝑧) = (𝑅‘0))
2	1	fveq2d 6195	. . . . 5 ⊢ (𝑧 = 0 → (𝐼‘(𝑅‘𝑧)) = (𝐼‘(𝑅‘0)))
3	2	eqeq1d 2624	. . . 4 ⊢ (𝑧 = 0 → ((𝐼‘(𝑅‘𝑧)) = (𝐼‘(𝑅‘0)) ↔ (𝐼‘(𝑅‘0)) = (𝐼‘(𝑅‘0))))
4	3	imbi2d 330	. . 3 ⊢ (𝑧 = 0 → ((𝐴 ∈ 𝑆 → (𝐼‘(𝑅‘𝑧)) = (𝐼‘(𝑅‘0))) ↔ (𝐴 ∈ 𝑆 → (𝐼‘(𝑅‘0)) = (𝐼‘(𝑅‘0)))))
5		fveq2 6191	. . . . . 6 ⊢ (𝑧 = 𝑘 → (𝑅‘𝑧) = (𝑅‘𝑘))
6	5	fveq2d 6195	. . . . 5 ⊢ (𝑧 = 𝑘 → (𝐼‘(𝑅‘𝑧)) = (𝐼‘(𝑅‘𝑘)))
7	6	eqeq1d 2624	. . . 4 ⊢ (𝑧 = 𝑘 → ((𝐼‘(𝑅‘𝑧)) = (𝐼‘(𝑅‘0)) ↔ (𝐼‘(𝑅‘𝑘)) = (𝐼‘(𝑅‘0))))
8	7	imbi2d 330	. . 3 ⊢ (𝑧 = 𝑘 → ((𝐴 ∈ 𝑆 → (𝐼‘(𝑅‘𝑧)) = (𝐼‘(𝑅‘0))) ↔ (𝐴 ∈ 𝑆 → (𝐼‘(𝑅‘𝑘)) = (𝐼‘(𝑅‘0)))))
9		fveq2 6191	. . . . . 6 ⊢ (𝑧 = (𝑘 + 1) → (𝑅‘𝑧) = (𝑅‘(𝑘 + 1)))
10	9	fveq2d 6195	. . . . 5 ⊢ (𝑧 = (𝑘 + 1) → (𝐼‘(𝑅‘𝑧)) = (𝐼‘(𝑅‘(𝑘 + 1))))
11	10	eqeq1d 2624	. . . 4 ⊢ (𝑧 = (𝑘 + 1) → ((𝐼‘(𝑅‘𝑧)) = (𝐼‘(𝑅‘0)) ↔ (𝐼‘(𝑅‘(𝑘 + 1))) = (𝐼‘(𝑅‘0))))
12	11	imbi2d 330	. . 3 ⊢ (𝑧 = (𝑘 + 1) → ((𝐴 ∈ 𝑆 → (𝐼‘(𝑅‘𝑧)) = (𝐼‘(𝑅‘0))) ↔ (𝐴 ∈ 𝑆 → (𝐼‘(𝑅‘(𝑘 + 1))) = (𝐼‘(𝑅‘0)))))
13		fveq2 6191	. . . . . 6 ⊢ (𝑧 = 𝐾 → (𝑅‘𝑧) = (𝑅‘𝐾))
14	13	fveq2d 6195	. . . . 5 ⊢ (𝑧 = 𝐾 → (𝐼‘(𝑅‘𝑧)) = (𝐼‘(𝑅‘𝐾)))
15	14	eqeq1d 2624	. . . 4 ⊢ (𝑧 = 𝐾 → ((𝐼‘(𝑅‘𝑧)) = (𝐼‘(𝑅‘0)) ↔ (𝐼‘(𝑅‘𝐾)) = (𝐼‘(𝑅‘0))))
16	15	imbi2d 330	. . 3 ⊢ (𝑧 = 𝐾 → ((𝐴 ∈ 𝑆 → (𝐼‘(𝑅‘𝑧)) = (𝐼‘(𝑅‘0))) ↔ (𝐴 ∈ 𝑆 → (𝐼‘(𝑅‘𝐾)) = (𝐼‘(𝑅‘0)))))
17		eqidd 2623	. . 3 ⊢ (𝐴 ∈ 𝑆 → (𝐼‘(𝑅‘0)) = (𝐼‘(𝑅‘0)))
18		nn0uz 11722	. . . . . . . . . 10 ⊢ ℕ0 = (ℤ≥‘0)
19		alginv.1	. . . . . . . . . 10 ⊢ 𝑅 = seq0((𝐹 ∘ 1st ), (ℕ0 × {𝐴}))
20		0zd 11389	. . . . . . . . . 10 ⊢ (𝐴 ∈ 𝑆 → 0 ∈ ℤ)
21		id 22	. . . . . . . . . 10 ⊢ (𝐴 ∈ 𝑆 → 𝐴 ∈ 𝑆)
22		alginv.2	. . . . . . . . . . 11 ⊢ 𝐹:𝑆⟶𝑆
23	22	a1i 11	. . . . . . . . . 10 ⊢ (𝐴 ∈ 𝑆 → 𝐹:𝑆⟶𝑆)
24	18, 19, 20, 21, 23	algrp1 15287	. . . . . . . . 9 ⊢ ((𝐴 ∈ 𝑆 ∧ 𝑘 ∈ ℕ0) → (𝑅‘(𝑘 + 1)) = (𝐹‘(𝑅‘𝑘)))
25	24	fveq2d 6195	. . . . . . . 8 ⊢ ((𝐴 ∈ 𝑆 ∧ 𝑘 ∈ ℕ0) → (𝐼‘(𝑅‘(𝑘 + 1))) = (𝐼‘(𝐹‘(𝑅‘𝑘))))
26	18, 19, 20, 21, 23	algrf 15286	. . . . . . . . . 10 ⊢ (𝐴 ∈ 𝑆 → 𝑅:ℕ0⟶𝑆)
27	26	ffvelrnda 6359	. . . . . . . . 9 ⊢ ((𝐴 ∈ 𝑆 ∧ 𝑘 ∈ ℕ0) → (𝑅‘𝑘) ∈ 𝑆)
28		fveq2 6191	. . . . . . . . . . . 12 ⊢ (𝑥 = (𝑅‘𝑘) → (𝐹‘𝑥) = (𝐹‘(𝑅‘𝑘)))
29	28	fveq2d 6195	. . . . . . . . . . 11 ⊢ (𝑥 = (𝑅‘𝑘) → (𝐼‘(𝐹‘𝑥)) = (𝐼‘(𝐹‘(𝑅‘𝑘))))
30		fveq2 6191	. . . . . . . . . . 11 ⊢ (𝑥 = (𝑅‘𝑘) → (𝐼‘𝑥) = (𝐼‘(𝑅‘𝑘)))
31	29, 30	eqeq12d 2637	. . . . . . . . . 10 ⊢ (𝑥 = (𝑅‘𝑘) → ((𝐼‘(𝐹‘𝑥)) = (𝐼‘𝑥) ↔ (𝐼‘(𝐹‘(𝑅‘𝑘))) = (𝐼‘(𝑅‘𝑘))))
32		alginv.4	. . . . . . . . . 10 ⊢ (𝑥 ∈ 𝑆 → (𝐼‘(𝐹‘𝑥)) = (𝐼‘𝑥))
33	31, 32	vtoclga 3272	. . . . . . . . 9 ⊢ ((𝑅‘𝑘) ∈ 𝑆 → (𝐼‘(𝐹‘(𝑅‘𝑘))) = (𝐼‘(𝑅‘𝑘)))
34	27, 33	syl 17	. . . . . . . 8 ⊢ ((𝐴 ∈ 𝑆 ∧ 𝑘 ∈ ℕ0) → (𝐼‘(𝐹‘(𝑅‘𝑘))) = (𝐼‘(𝑅‘𝑘)))
35	25, 34	eqtrd 2656	. . . . . . 7 ⊢ ((𝐴 ∈ 𝑆 ∧ 𝑘 ∈ ℕ0) → (𝐼‘(𝑅‘(𝑘 + 1))) = (𝐼‘(𝑅‘𝑘)))
36	35	eqeq1d 2624	. . . . . 6 ⊢ ((𝐴 ∈ 𝑆 ∧ 𝑘 ∈ ℕ0) → ((𝐼‘(𝑅‘(𝑘 + 1))) = (𝐼‘(𝑅‘0)) ↔ (𝐼‘(𝑅‘𝑘)) = (𝐼‘(𝑅‘0))))
37	36	biimprd 238	. . . . 5 ⊢ ((𝐴 ∈ 𝑆 ∧ 𝑘 ∈ ℕ0) → ((𝐼‘(𝑅‘𝑘)) = (𝐼‘(𝑅‘0)) → (𝐼‘(𝑅‘(𝑘 + 1))) = (𝐼‘(𝑅‘0))))
38	37	expcom 451	. . . 4 ⊢ (𝑘 ∈ ℕ0 → (𝐴 ∈ 𝑆 → ((𝐼‘(𝑅‘𝑘)) = (𝐼‘(𝑅‘0)) → (𝐼‘(𝑅‘(𝑘 + 1))) = (𝐼‘(𝑅‘0)))))
39	38	a2d 29	. . 3 ⊢ (𝑘 ∈ ℕ0 → ((𝐴 ∈ 𝑆 → (𝐼‘(𝑅‘𝑘)) = (𝐼‘(𝑅‘0))) → (𝐴 ∈ 𝑆 → (𝐼‘(𝑅‘(𝑘 + 1))) = (𝐼‘(𝑅‘0)))))
40	4, 8, 12, 16, 17, 39	nn0ind 11472	. 2 ⊢ (𝐾 ∈ ℕ0 → (𝐴 ∈ 𝑆 → (𝐼‘(𝑅‘𝐾)) = (𝐼‘(𝑅‘0))))
41	40	impcom 446	1 ⊢ ((𝐴 ∈ 𝑆 ∧ 𝐾 ∈ ℕ0) → (𝐼‘(𝑅‘𝐾)) = (𝐼‘(𝑅‘0)))

Syntax hints:   → wi 4   ∧ wa 384   = wceq 1483   ∈ wcel 1990  {csn 4177   × cxp 5112   ∘ ccom 5118   Fn wfn 5883  ⟶wf 5884  ‘cfv 5888  (class class class)co 6650  1^st c1st 7166  0cc0 9936  1c1 9937   + caddc 9939  ℕ₀cn0 11292  seqcseq 12801

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1722  ax-4 1737  ax-5 1839  ax-6 1888  ax-7 1935  ax-8 1992  ax-9 1999  ax-10 2019  ax-11 2034  ax-12 2047  ax-13 2246  ax-ext 2602  ax-sep 4781  ax-nul 4789  ax-pow 4843  ax-pr 4906  ax-un 6949  ax-cnex 9992  ax-resscn 9993  ax-1cn 9994  ax-icn 9995  ax-addcl 9996  ax-addrcl 9997  ax-mulcl 9998  ax-mulrcl 9999  ax-mulcom 10000  ax-addass 10001  ax-mulass 10002  ax-distr 10003  ax-i2m1 10004  ax-1ne0 10005  ax-1rid 10006  ax-rnegex 10007  ax-rrecex 10008  ax-cnre 10009  ax-pre-lttri 10010  ax-pre-lttrn 10011  ax-pre-ltadd 10012  ax-pre-mulgt0 10013

This theorem depends on definitions:  df-bi 197  df-or 385  df-an 386  df-3or 1038  df-3an 1039  df-tru 1486  df-ex 1705  df-nf 1710  df-sb 1881  df-eu 2474  df-mo 2475  df-clab 2609  df-cleq 2615  df-clel 2618  df-nfc 2753  df-ne 2795  df-nel 2898  df-ral 2917  df-rex 2918  df-reu 2919  df-rab 2921  df-v 3202  df-sbc 3436  df-csb 3534  df-dif 3577  df-un 3579  df-in 3581  df-ss 3588  df-pss 3590  df-nul 3916  df-if 4087  df-pw 4160  df-sn 4178  df-pr 4180  df-tp 4182  df-op 4184  df-uni 4437  df-iun 4522  df-br 4654  df-opab 4713  df-mpt 4730  df-tr 4753  df-id 5024  df-eprel 5029  df-po 5035  df-so 5036  df-fr 5073  df-we 5075  df-xp 5120  df-rel 5121  df-cnv 5122  df-co 5123  df-dm 5124  df-rn 5125  df-res 5126  df-ima 5127  df-pred 5680  df-ord 5726  df-on 5727  df-lim 5728  df-suc 5729  df-iota 5851  df-fun 5890  df-fn 5891  df-f 5892  df-f1 5893  df-fo 5894  df-f1o 5895  df-fv 5896  df-riota 6611  df-ov 6653  df-oprab 6654  df-mpt2 6655  df-om 7066  df-1st 7168  df-2nd 7169  df-wrecs 7407  df-recs 7468  df-rdg 7506  df-er 7742  df-en 7956  df-dom 7957  df-sdom 7958  df-pnf 10076  df-mnf 10077  df-xr 10078  df-ltxr 10079  df-le 10080  df-sub 10268  df-neg 10269  df-nn 11021  df-n0 11293  df-z 11378  df-uz 11688  df-fz 12327  df-seq 12802

This theorem is referenced by:  eucalg  15300