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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:𝑆𝑆
alginv.3 𝐼 Fn 𝑆
alginv.4 (𝑥𝑆 → (𝐼‘(𝐹𝑥)) = (𝐼𝑥))
Assertion
Ref Expression
alginv ((𝐴𝑆𝐾 ∈ ℕ0) → (𝐼‘(𝑅𝐾)) = (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.
StepHypRef Expression
1 fveq2 6103 . . . . . 6 (𝑧 = 0 → (𝑅𝑧) = (𝑅‘0))
21fveq2d 6107 . . . . 5 (𝑧 = 0 → (𝐼‘(𝑅𝑧)) = (𝐼‘(𝑅‘0)))
32eqeq1d 2612 . . . 4 (𝑧 = 0 → ((𝐼‘(𝑅𝑧)) = (𝐼‘(𝑅‘0)) ↔ (𝐼‘(𝑅‘0)) = (𝐼‘(𝑅‘0))))
43imbi2d 329 . . 3 (𝑧 = 0 → ((𝐴𝑆 → (𝐼‘(𝑅𝑧)) = (𝐼‘(𝑅‘0))) ↔ (𝐴𝑆 → (𝐼‘(𝑅‘0)) = (𝐼‘(𝑅‘0)))))
5 fveq2 6103 . . . . . 6 (𝑧 = 𝑘 → (𝑅𝑧) = (𝑅𝑘))
65fveq2d 6107 . . . . 5 (𝑧 = 𝑘 → (𝐼‘(𝑅𝑧)) = (𝐼‘(𝑅𝑘)))
76eqeq1d 2612 . . . 4 (𝑧 = 𝑘 → ((𝐼‘(𝑅𝑧)) = (𝐼‘(𝑅‘0)) ↔ (𝐼‘(𝑅𝑘)) = (𝐼‘(𝑅‘0))))
87imbi2d 329 . . 3 (𝑧 = 𝑘 → ((𝐴𝑆 → (𝐼‘(𝑅𝑧)) = (𝐼‘(𝑅‘0))) ↔ (𝐴𝑆 → (𝐼‘(𝑅𝑘)) = (𝐼‘(𝑅‘0)))))
9 fveq2 6103 . . . . . 6 (𝑧 = (𝑘 + 1) → (𝑅𝑧) = (𝑅‘(𝑘 + 1)))
109fveq2d 6107 . . . . 5 (𝑧 = (𝑘 + 1) → (𝐼‘(𝑅𝑧)) = (𝐼‘(𝑅‘(𝑘 + 1))))
1110eqeq1d 2612 . . . 4 (𝑧 = (𝑘 + 1) → ((𝐼‘(𝑅𝑧)) = (𝐼‘(𝑅‘0)) ↔ (𝐼‘(𝑅‘(𝑘 + 1))) = (𝐼‘(𝑅‘0))))
1211imbi2d 329 . . 3 (𝑧 = (𝑘 + 1) → ((𝐴𝑆 → (𝐼‘(𝑅𝑧)) = (𝐼‘(𝑅‘0))) ↔ (𝐴𝑆 → (𝐼‘(𝑅‘(𝑘 + 1))) = (𝐼‘(𝑅‘0)))))
13 fveq2 6103 . . . . . 6 (𝑧 = 𝐾 → (𝑅𝑧) = (𝑅𝐾))
1413fveq2d 6107 . . . . 5 (𝑧 = 𝐾 → (𝐼‘(𝑅𝑧)) = (𝐼‘(𝑅𝐾)))
1514eqeq1d 2612 . . . 4 (𝑧 = 𝐾 → ((𝐼‘(𝑅𝑧)) = (𝐼‘(𝑅‘0)) ↔ (𝐼‘(𝑅𝐾)) = (𝐼‘(𝑅‘0))))
1615imbi2d 329 . . 3 (𝑧 = 𝐾 → ((𝐴𝑆 → (𝐼‘(𝑅𝑧)) = (𝐼‘(𝑅‘0))) ↔ (𝐴𝑆 → (𝐼‘(𝑅𝐾)) = (𝐼‘(𝑅‘0)))))
17 eqidd 2611 . . 3 (𝐴𝑆 → (𝐼‘(𝑅‘0)) = (𝐼‘(𝑅‘0)))
18 nn0uz 11598 . . . . . . . . . 10 0 = (ℤ‘0)
19 alginv.1 . . . . . . . . . 10 𝑅 = seq0((𝐹 ∘ 1st ), (ℕ0 × {𝐴}))
20 0zd 11266 . . . . . . . . . 10 (𝐴𝑆 → 0 ∈ ℤ)
21 id 22 . . . . . . . . . 10 (𝐴𝑆𝐴𝑆)
22 alginv.2 . . . . . . . . . . 11 𝐹:𝑆𝑆
2322a1i 11 . . . . . . . . . 10 (𝐴𝑆𝐹:𝑆𝑆)
2418, 19, 20, 21, 23algrp1 15125 . . . . . . . . 9 ((𝐴𝑆𝑘 ∈ ℕ0) → (𝑅‘(𝑘 + 1)) = (𝐹‘(𝑅𝑘)))
2524fveq2d 6107 . . . . . . . 8 ((𝐴𝑆𝑘 ∈ ℕ0) → (𝐼‘(𝑅‘(𝑘 + 1))) = (𝐼‘(𝐹‘(𝑅𝑘))))
2618, 19, 20, 21, 23algrf 15124 . . . . . . . . . 10 (𝐴𝑆𝑅:ℕ0𝑆)
2726ffvelrnda 6267 . . . . . . . . 9 ((𝐴𝑆𝑘 ∈ ℕ0) → (𝑅𝑘) ∈ 𝑆)
28 fveq2 6103 . . . . . . . . . . . 12 (𝑥 = (𝑅𝑘) → (𝐹𝑥) = (𝐹‘(𝑅𝑘)))
2928fveq2d 6107 . . . . . . . . . . 11 (𝑥 = (𝑅𝑘) → (𝐼‘(𝐹𝑥)) = (𝐼‘(𝐹‘(𝑅𝑘))))
30 fveq2 6103 . . . . . . . . . . 11 (𝑥 = (𝑅𝑘) → (𝐼𝑥) = (𝐼‘(𝑅𝑘)))
3129, 30eqeq12d 2625 . . . . . . . . . 10 (𝑥 = (𝑅𝑘) → ((𝐼‘(𝐹𝑥)) = (𝐼𝑥) ↔ (𝐼‘(𝐹‘(𝑅𝑘))) = (𝐼‘(𝑅𝑘))))
32 alginv.4 . . . . . . . . . 10 (𝑥𝑆 → (𝐼‘(𝐹𝑥)) = (𝐼𝑥))
3331, 32vtoclga 3245 . . . . . . . . 9 ((𝑅𝑘) ∈ 𝑆 → (𝐼‘(𝐹‘(𝑅𝑘))) = (𝐼‘(𝑅𝑘)))
3427, 33syl 17 . . . . . . . 8 ((𝐴𝑆𝑘 ∈ ℕ0) → (𝐼‘(𝐹‘(𝑅𝑘))) = (𝐼‘(𝑅𝑘)))
3525, 34eqtrd 2644 . . . . . . 7 ((𝐴𝑆𝑘 ∈ ℕ0) → (𝐼‘(𝑅‘(𝑘 + 1))) = (𝐼‘(𝑅𝑘)))
3635eqeq1d 2612 . . . . . 6 ((𝐴𝑆𝑘 ∈ ℕ0) → ((𝐼‘(𝑅‘(𝑘 + 1))) = (𝐼‘(𝑅‘0)) ↔ (𝐼‘(𝑅𝑘)) = (𝐼‘(𝑅‘0))))
3736biimprd 237 . . . . 5 ((𝐴𝑆𝑘 ∈ ℕ0) → ((𝐼‘(𝑅𝑘)) = (𝐼‘(𝑅‘0)) → (𝐼‘(𝑅‘(𝑘 + 1))) = (𝐼‘(𝑅‘0))))
3837expcom 450 . . . 4 (𝑘 ∈ ℕ0 → (𝐴𝑆 → ((𝐼‘(𝑅𝑘)) = (𝐼‘(𝑅‘0)) → (𝐼‘(𝑅‘(𝑘 + 1))) = (𝐼‘(𝑅‘0)))))
3938a2d 29 . . 3 (𝑘 ∈ ℕ0 → ((𝐴𝑆 → (𝐼‘(𝑅𝑘)) = (𝐼‘(𝑅‘0))) → (𝐴𝑆 → (𝐼‘(𝑅‘(𝑘 + 1))) = (𝐼‘(𝑅‘0)))))
404, 8, 12, 16, 17, 39nn0ind 11348 . 2 (𝐾 ∈ ℕ0 → (𝐴𝑆 → (𝐼‘(𝑅𝐾)) = (𝐼‘(𝑅‘0))))
4140impcom 445 1 ((𝐴𝑆𝐾 ∈ ℕ0) → (𝐼‘(𝑅𝐾)) = (𝐼‘(𝑅‘0)))
 Colors of variables: wff setvar class 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  1st 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
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