Theorem alginv 15126

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 6103	. . . . . 6 ⊢ (𝑧 = 0 → (𝑅‘𝑧) = (𝑅‘0))
2	1	fveq2d 6107	. . . . 5 ⊢ (𝑧 = 0 → (𝐼‘(𝑅‘𝑧)) = (𝐼‘(𝑅‘0)))
3	2	eqeq1d 2612	. . . 4 ⊢ (𝑧 = 0 → ((𝐼‘(𝑅‘𝑧)) = (𝐼‘(𝑅‘0)) ↔ (𝐼‘(𝑅‘0)) = (𝐼‘(𝑅‘0))))
4	3	imbi2d 329	. . 3 ⊢ (𝑧 = 0 → ((𝐴 ∈ 𝑆 → (𝐼‘(𝑅‘𝑧)) = (𝐼‘(𝑅‘0))) ↔ (𝐴 ∈ 𝑆 → (𝐼‘(𝑅‘0)) = (𝐼‘(𝑅‘0)))))
5		fveq2 6103	. . . . . 6 ⊢ (𝑧 = 𝑘 → (𝑅‘𝑧) = (𝑅‘𝑘))
6	5	fveq2d 6107	. . . . 5 ⊢ (𝑧 = 𝑘 → (𝐼‘(𝑅‘𝑧)) = (𝐼‘(𝑅‘𝑘)))
7	6	eqeq1d 2612	. . . 4 ⊢ (𝑧 = 𝑘 → ((𝐼‘(𝑅‘𝑧)) = (𝐼‘(𝑅‘0)) ↔ (𝐼‘(𝑅‘𝑘)) = (𝐼‘(𝑅‘0))))
8	7	imbi2d 329	. . 3 ⊢ (𝑧 = 𝑘 → ((𝐴 ∈ 𝑆 → (𝐼‘(𝑅‘𝑧)) = (𝐼‘(𝑅‘0))) ↔ (𝐴 ∈ 𝑆 → (𝐼‘(𝑅‘𝑘)) = (𝐼‘(𝑅‘0)))))
9		fveq2 6103	. . . . . 6 ⊢ (𝑧 = (𝑘 + 1) → (𝑅‘𝑧) = (𝑅‘(𝑘 + 1)))
10	9	fveq2d 6107	. . . . 5 ⊢ (𝑧 = (𝑘 + 1) → (𝐼‘(𝑅‘𝑧)) = (𝐼‘(𝑅‘(𝑘 + 1))))
11	10	eqeq1d 2612	. . . 4 ⊢ (𝑧 = (𝑘 + 1) → ((𝐼‘(𝑅‘𝑧)) = (𝐼‘(𝑅‘0)) ↔ (𝐼‘(𝑅‘(𝑘 + 1))) = (𝐼‘(𝑅‘0))))
12	11	imbi2d 329	. . 3 ⊢ (𝑧 = (𝑘 + 1) → ((𝐴 ∈ 𝑆 → (𝐼‘(𝑅‘𝑧)) = (𝐼‘(𝑅‘0))) ↔ (𝐴 ∈ 𝑆 → (𝐼‘(𝑅‘(𝑘 + 1))) = (𝐼‘(𝑅‘0)))))
13		fveq2 6103	. . . . . 6 ⊢ (𝑧 = 𝐾 → (𝑅‘𝑧) = (𝑅‘𝐾))
14	13	fveq2d 6107	. . . . 5 ⊢ (𝑧 = 𝐾 → (𝐼‘(𝑅‘𝑧)) = (𝐼‘(𝑅‘𝐾)))
15	14	eqeq1d 2612	. . . 4 ⊢ (𝑧 = 𝐾 → ((𝐼‘(𝑅‘𝑧)) = (𝐼‘(𝑅‘0)) ↔ (𝐼‘(𝑅‘𝐾)) = (𝐼‘(𝑅‘0))))
16	15	imbi2d 329	. . 3 ⊢ (𝑧 = 𝐾 → ((𝐴 ∈ 𝑆 → (𝐼‘(𝑅‘𝑧)) = (𝐼‘(𝑅‘0))) ↔ (𝐴 ∈ 𝑆 → (𝐼‘(𝑅‘𝐾)) = (𝐼‘(𝑅‘0)))))
17		eqidd 2611	. . 3 ⊢ (𝐴 ∈ 𝑆 → (𝐼‘(𝑅‘0)) = (𝐼‘(𝑅‘0)))
18		nn0uz 11598	. . . . . . . . . 10 ⊢ ℕ0 = (ℤ≥‘0)
19		alginv.1	. . . . . . . . . 10 ⊢ 𝑅 = seq0((𝐹 ∘ 1st ), (ℕ0 × {𝐴}))
20		0zd 11266	. . . . . . . . . 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 15125	. . . . . . . . 9 ⊢ ((𝐴 ∈ 𝑆 ∧ 𝑘 ∈ ℕ0) → (𝑅‘(𝑘 + 1)) = (𝐹‘(𝑅‘𝑘)))
25	24	fveq2d 6107	. . . . . . . 8 ⊢ ((𝐴 ∈ 𝑆 ∧ 𝑘 ∈ ℕ0) → (𝐼‘(𝑅‘(𝑘 + 1))) = (𝐼‘(𝐹‘(𝑅‘𝑘))))
26	18, 19, 20, 21, 23	algrf 15124	. . . . . . . . . 10 ⊢ (𝐴 ∈ 𝑆 → 𝑅:ℕ0⟶𝑆)
27	26	ffvelrnda 6267	. . . . . . . . 9 ⊢ ((𝐴 ∈ 𝑆 ∧ 𝑘 ∈ ℕ0) → (𝑅‘𝑘) ∈ 𝑆)
28		fveq2 6103	. . . . . . . . . . . 12 ⊢ (𝑥 = (𝑅‘𝑘) → (𝐹‘𝑥) = (𝐹‘(𝑅‘𝑘)))
29	28	fveq2d 6107	. . . . . . . . . . 11 ⊢ (𝑥 = (𝑅‘𝑘) → (𝐼‘(𝐹‘𝑥)) = (𝐼‘(𝐹‘(𝑅‘𝑘))))
30		fveq2 6103	. . . . . . . . . . 11 ⊢ (𝑥 = (𝑅‘𝑘) → (𝐼‘𝑥) = (𝐼‘(𝑅‘𝑘)))
31	29, 30	eqeq12d 2625	. . . . . . . . . 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 3245	. . . . . . . . 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 2644	. . . . . . 7 ⊢ ((𝐴 ∈ 𝑆 ∧ 𝑘 ∈ ℕ0) → (𝐼‘(𝑅‘(𝑘 + 1))) = (𝐼‘(𝑅‘𝑘)))
36	35	eqeq1d 2612	. . . . . 6 ⊢ ((𝐴 ∈ 𝑆 ∧ 𝑘 ∈ ℕ0) → ((𝐼‘(𝑅‘(𝑘 + 1))) = (𝐼‘(𝑅‘0)) ↔ (𝐼‘(𝑅‘𝑘)) = (𝐼‘(𝑅‘0))))
37	36	biimprd 237	. . . . 5 ⊢ ((𝐴 ∈ 𝑆 ∧ 𝑘 ∈ ℕ0) → ((𝐼‘(𝑅‘𝑘)) = (𝐼‘(𝑅‘0)) → (𝐼‘(𝑅‘(𝑘 + 1))) = (𝐼‘(𝑅‘0))))
38	37	expcom 450	. . . 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 11348	. 2 ⊢ (𝐾 ∈ ℕ0 → (𝐴 ∈ 𝑆 → (𝐼‘(𝑅‘𝐾)) = (𝐼‘(𝑅‘0))))
41	40	impcom 445	1 ⊢ ((𝐴 ∈ 𝑆 ∧ 𝐾 ∈ ℕ0) → (𝐼‘(𝑅‘𝐾)) = (𝐼‘(𝑅‘0)))

Syntax hints:   → wi 4   ∧ wa 383   = wceq 1475   ∈ wcel 1977  {csn 4125   × cxp 5036   ∘ ccom 5042   Fn wfn 5799  ⟶wf 5800  ‘cfv 5804  (class class class)co 6549  1^st c1st 7057  0cc0 9815  1c1 9816   + caddc 9818  ℕ₀cn0 11169  seqcseq 12663

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1713  ax-4 1728  ax-5 1827  ax-6 1875  ax-7 1922  ax-8 1979  ax-9 1986  ax-10 2006  ax-11 2021  ax-12 2034  ax-13 2234  ax-ext 2590  ax-sep 4709  ax-nul 4717  ax-pow 4769  ax-pr 4833  ax-un 6847  ax-cnex 9871  ax-resscn 9872  ax-1cn 9873  ax-icn 9874  ax-addcl 9875  ax-addrcl 9876  ax-mulcl 9877  ax-mulrcl 9878  ax-mulcom 9879  ax-addass 9880  ax-mulass 9881  ax-distr 9882  ax-i2m1 9883  ax-1ne0 9884  ax-1rid 9885  ax-rnegex 9886  ax-rrecex 9887  ax-cnre 9888  ax-pre-lttri 9889  ax-pre-lttrn 9890  ax-pre-ltadd 9891  ax-pre-mulgt0 9892

This theorem depends on definitions:  df-bi 196  df-or 384  df-an 385  df-3or 1032  df-3an 1033  df-tru 1478  df-ex 1696  df-nf 1701  df-sb 1868  df-eu 2462  df-mo 2463  df-clab 2597  df-cleq 2603  df-clel 2606  df-nfc 2740  df-ne 2782  df-nel 2783  df-ral 2901  df-rex 2902  df-reu 2903  df-rab 2905  df-v 3175  df-sbc 3403  df-csb 3500  df-dif 3543  df-un 3545  df-in 3547  df-ss 3554  df-pss 3556  df-nul 3875  df-if 4037  df-pw 4110  df-sn 4126  df-pr 4128  df-tp 4130  df-op 4132  df-uni 4373  df-iun 4457  df-br 4584  df-opab 4644  df-mpt 4645  df-tr 4681  df-eprel 4949  df-id 4953  df-po 4959  df-so 4960  df-fr 4997  df-we 4999  df-xp 5044  df-rel 5045  df-cnv 5046  df-co 5047  df-dm 5048  df-rn 5049  df-res 5050  df-ima 5051  df-pred 5597  df-ord 5643  df-on 5644  df-lim 5645  df-suc 5646  df-iota 5768  df-fun 5806  df-fn 5807  df-f 5808  df-f1 5809  df-fo 5810  df-f1o 5811  df-fv 5812  df-riota 6511  df-ov 6552  df-oprab 6553  df-mpt2 6554  df-om 6958  df-1st 7059  df-2nd 7060  df-wrecs 7294  df-recs 7355  df-rdg 7393  df-er 7629  df-en 7842  df-dom 7843  df-sdom 7844  df-pnf 9955  df-mnf 9956  df-xr 9957  df-ltxr 9958  df-le 9959  df-sub 10147  df-neg 10148  df-nn 10898  df-n0 11170  df-z 11255  df-uz 11564  df-fz 12198  df-seq 12664

This theorem is referenced by:  eucalg  15138