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Theorem eucalgcvga 11773
 Description: Once Euclid's Algorithm halts after 𝑁 steps, the second element of the state remains 0 . (Contributed by Paul Chapman, 22-Jun-2011.) (Revised by Mario Carneiro, 29-May-2014.)
Hypotheses
Ref Expression
eucalgval.1 𝐸 = (𝑥 ∈ ℕ0, 𝑦 ∈ ℕ0 ↦ if(𝑦 = 0, ⟨𝑥, 𝑦⟩, ⟨𝑦, (𝑥 mod 𝑦)⟩))
eucalg.2 𝑅 = seq0((𝐸 ∘ 1st ), (ℕ0 × {𝐴}))
eucalgcvga.3 𝑁 = (2nd𝐴)
Assertion
Ref Expression
eucalgcvga (𝐴 ∈ (ℕ0 × ℕ0) → (𝐾 ∈ (ℤ𝑁) → (2nd ‘(𝑅𝐾)) = 0))
Distinct variable groups:   𝑥,𝑦,𝑁   𝑥,𝐴,𝑦   𝑥,𝑅
Allowed substitution hints:   𝑅(𝑦)   𝐸(𝑥,𝑦)   𝐾(𝑥,𝑦)

Proof of Theorem eucalgcvga
Dummy variable 𝑧 is distinct from all other variables.
StepHypRef Expression
1 eucalgcvga.3 . . . . . . 7 𝑁 = (2nd𝐴)
2 xp2nd 6071 . . . . . . 7 (𝐴 ∈ (ℕ0 × ℕ0) → (2nd𝐴) ∈ ℕ0)
31, 2eqeltrid 2227 . . . . . 6 (𝐴 ∈ (ℕ0 × ℕ0) → 𝑁 ∈ ℕ0)
4 eluznn0 9419 . . . . . 6 ((𝑁 ∈ ℕ0𝐾 ∈ (ℤ𝑁)) → 𝐾 ∈ ℕ0)
53, 4sylan 281 . . . . 5 ((𝐴 ∈ (ℕ0 × ℕ0) ∧ 𝐾 ∈ (ℤ𝑁)) → 𝐾 ∈ ℕ0)
6 nn0uz 9383 . . . . . . 7 0 = (ℤ‘0)
7 eucalg.2 . . . . . . 7 𝑅 = seq0((𝐸 ∘ 1st ), (ℕ0 × {𝐴}))
8 0zd 9089 . . . . . . 7 (𝐴 ∈ (ℕ0 × ℕ0) → 0 ∈ ℤ)
9 id 19 . . . . . . 7 (𝐴 ∈ (ℕ0 × ℕ0) → 𝐴 ∈ (ℕ0 × ℕ0))
10 eucalgval.1 . . . . . . . . 9 𝐸 = (𝑥 ∈ ℕ0, 𝑦 ∈ ℕ0 ↦ if(𝑦 = 0, ⟨𝑥, 𝑦⟩, ⟨𝑦, (𝑥 mod 𝑦)⟩))
1110eucalgf 11770 . . . . . . . 8 𝐸:(ℕ0 × ℕ0)⟶(ℕ0 × ℕ0)
1211a1i 9 . . . . . . 7 (𝐴 ∈ (ℕ0 × ℕ0) → 𝐸:(ℕ0 × ℕ0)⟶(ℕ0 × ℕ0))
136, 7, 8, 9, 12algrf 11760 . . . . . 6 (𝐴 ∈ (ℕ0 × ℕ0) → 𝑅:ℕ0⟶(ℕ0 × ℕ0))
1413ffvelrnda 5562 . . . . 5 ((𝐴 ∈ (ℕ0 × ℕ0) ∧ 𝐾 ∈ ℕ0) → (𝑅𝐾) ∈ (ℕ0 × ℕ0))
155, 14syldan 280 . . . 4 ((𝐴 ∈ (ℕ0 × ℕ0) ∧ 𝐾 ∈ (ℤ𝑁)) → (𝑅𝐾) ∈ (ℕ0 × ℕ0))
16 fvres 5452 . . . 4 ((𝑅𝐾) ∈ (ℕ0 × ℕ0) → ((2nd ↾ (ℕ0 × ℕ0))‘(𝑅𝐾)) = (2nd ‘(𝑅𝐾)))
1715, 16syl 14 . . 3 ((𝐴 ∈ (ℕ0 × ℕ0) ∧ 𝐾 ∈ (ℤ𝑁)) → ((2nd ↾ (ℕ0 × ℕ0))‘(𝑅𝐾)) = (2nd ‘(𝑅𝐾)))
18 simpl 108 . . . 4 ((𝐴 ∈ (ℕ0 × ℕ0) ∧ 𝐾 ∈ (ℤ𝑁)) → 𝐴 ∈ (ℕ0 × ℕ0))
19 fvres 5452 . . . . . . . 8 (𝐴 ∈ (ℕ0 × ℕ0) → ((2nd ↾ (ℕ0 × ℕ0))‘𝐴) = (2nd𝐴))
2019, 1eqtr4di 2191 . . . . . . 7 (𝐴 ∈ (ℕ0 × ℕ0) → ((2nd ↾ (ℕ0 × ℕ0))‘𝐴) = 𝑁)
2120fveq2d 5432 . . . . . 6 (𝐴 ∈ (ℕ0 × ℕ0) → (ℤ‘((2nd ↾ (ℕ0 × ℕ0))‘𝐴)) = (ℤ𝑁))
2221eleq2d 2210 . . . . 5 (𝐴 ∈ (ℕ0 × ℕ0) → (𝐾 ∈ (ℤ‘((2nd ↾ (ℕ0 × ℕ0))‘𝐴)) ↔ 𝐾 ∈ (ℤ𝑁)))
2322biimpar 295 . . . 4 ((𝐴 ∈ (ℕ0 × ℕ0) ∧ 𝐾 ∈ (ℤ𝑁)) → 𝐾 ∈ (ℤ‘((2nd ↾ (ℕ0 × ℕ0))‘𝐴)))
24 f2ndres 6065 . . . . 5 (2nd ↾ (ℕ0 × ℕ0)):(ℕ0 × ℕ0)⟶ℕ0
2510eucalglt 11772 . . . . . 6 (𝑧 ∈ (ℕ0 × ℕ0) → ((2nd ‘(𝐸𝑧)) ≠ 0 → (2nd ‘(𝐸𝑧)) < (2nd𝑧)))
2611ffvelrni 5561 . . . . . . . 8 (𝑧 ∈ (ℕ0 × ℕ0) → (𝐸𝑧) ∈ (ℕ0 × ℕ0))
27 fvres 5452 . . . . . . . 8 ((𝐸𝑧) ∈ (ℕ0 × ℕ0) → ((2nd ↾ (ℕ0 × ℕ0))‘(𝐸𝑧)) = (2nd ‘(𝐸𝑧)))
2826, 27syl 14 . . . . . . 7 (𝑧 ∈ (ℕ0 × ℕ0) → ((2nd ↾ (ℕ0 × ℕ0))‘(𝐸𝑧)) = (2nd ‘(𝐸𝑧)))
2928neeq1d 2327 . . . . . 6 (𝑧 ∈ (ℕ0 × ℕ0) → (((2nd ↾ (ℕ0 × ℕ0))‘(𝐸𝑧)) ≠ 0 ↔ (2nd ‘(𝐸𝑧)) ≠ 0))
30 fvres 5452 . . . . . . 7 (𝑧 ∈ (ℕ0 × ℕ0) → ((2nd ↾ (ℕ0 × ℕ0))‘𝑧) = (2nd𝑧))
3128, 30breq12d 3949 . . . . . 6 (𝑧 ∈ (ℕ0 × ℕ0) → (((2nd ↾ (ℕ0 × ℕ0))‘(𝐸𝑧)) < ((2nd ↾ (ℕ0 × ℕ0))‘𝑧) ↔ (2nd ‘(𝐸𝑧)) < (2nd𝑧)))
3225, 29, 313imtr4d 202 . . . . 5 (𝑧 ∈ (ℕ0 × ℕ0) → (((2nd ↾ (ℕ0 × ℕ0))‘(𝐸𝑧)) ≠ 0 → ((2nd ↾ (ℕ0 × ℕ0))‘(𝐸𝑧)) < ((2nd ↾ (ℕ0 × ℕ0))‘𝑧)))
33 eqid 2140 . . . . 5 ((2nd ↾ (ℕ0 × ℕ0))‘𝐴) = ((2nd ↾ (ℕ0 × ℕ0))‘𝐴)
3411, 7, 24, 32, 33algcvga 11766 . . . 4 (𝐴 ∈ (ℕ0 × ℕ0) → (𝐾 ∈ (ℤ‘((2nd ↾ (ℕ0 × ℕ0))‘𝐴)) → ((2nd ↾ (ℕ0 × ℕ0))‘(𝑅𝐾)) = 0))
3518, 23, 34sylc 62 . . 3 ((𝐴 ∈ (ℕ0 × ℕ0) ∧ 𝐾 ∈ (ℤ𝑁)) → ((2nd ↾ (ℕ0 × ℕ0))‘(𝑅𝐾)) = 0)
3617, 35eqtr3d 2175 . 2 ((𝐴 ∈ (ℕ0 × ℕ0) ∧ 𝐾 ∈ (ℤ𝑁)) → (2nd ‘(𝑅𝐾)) = 0)
3736ex 114 1 (𝐴 ∈ (ℕ0 × ℕ0) → (𝐾 ∈ (ℤ𝑁) → (2nd ‘(𝑅𝐾)) = 0))
 Colors of variables: wff set class Syntax hints:   → wi 4   ∧ wa 103   = wceq 1332   ∈ wcel 1481   ≠ wne 2309  ifcif 3478  {csn 3531  ⟨cop 3534   class class class wbr 3936   × cxp 4544   ↾ cres 4548   ∘ ccom 4550  ⟶wf 5126  ‘cfv 5130  (class class class)co 5781   ∈ cmpo 5783  1st c1st 6043  2nd c2nd 6044  0cc0 7643   < clt 7823  ℕ0cn0 9000  ℤ≥cuz 9349   mod cmo 10125  seqcseq 10248 This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 105  ax-ia2 106  ax-ia3 107  ax-in1 604  ax-in2 605  ax-io 699  ax-5 1424  ax-7 1425  ax-gen 1426  ax-ie1 1470  ax-ie2 1471  ax-8 1483  ax-10 1484  ax-11 1485  ax-i12 1486  ax-bndl 1487  ax-4 1488  ax-13 1492  ax-14 1493  ax-17 1507  ax-i9 1511  ax-ial 1515  ax-i5r 1516  ax-ext 2122  ax-coll 4050  ax-sep 4053  ax-nul 4061  ax-pow 4105  ax-pr 4138  ax-un 4362  ax-setind 4459  ax-iinf 4509  ax-cnex 7734  ax-resscn 7735  ax-1cn 7736  ax-1re 7737  ax-icn 7738  ax-addcl 7739  ax-addrcl 7740  ax-mulcl 7741  ax-mulrcl 7742  ax-addcom 7743  ax-mulcom 7744  ax-addass 7745  ax-mulass 7746  ax-distr 7747  ax-i2m1 7748  ax-0lt1 7749  ax-1rid 7750  ax-0id 7751  ax-rnegex 7752  ax-precex 7753  ax-cnre 7754  ax-pre-ltirr 7755  ax-pre-ltwlin 7756  ax-pre-lttrn 7757  ax-pre-apti 7758  ax-pre-ltadd 7759  ax-pre-mulgt0 7760  ax-pre-mulext 7761  ax-arch 7762 This theorem depends on definitions:  df-bi 116  df-stab 817  df-dc 821  df-3or 964  df-3an 965  df-tru 1335  df-fal 1338  df-nf 1438  df-sb 1737  df-eu 2003  df-mo 2004  df-clab 2127  df-cleq 2133  df-clel 2136  df-nfc 2271  df-ne 2310  df-nel 2405  df-ral 2422  df-rex 2423  df-reu 2424  df-rmo 2425  df-rab 2426  df-v 2691  df-sbc 2913  df-csb 3007  df-dif 3077  df-un 3079  df-in 3081  df-ss 3088  df-nul 3368  df-if 3479  df-pw 3516  df-sn 3537  df-pr 3538  df-op 3540  df-uni 3744  df-int 3779  df-iun 3822  df-br 3937  df-opab 3997  df-mpt 3998  df-tr 4034  df-id 4222  df-po 4225  df-iso 4226  df-iord 4295  df-on 4297  df-ilim 4298  df-suc 4300  df-iom 4512  df-xp 4552  df-rel 4553  df-cnv 4554  df-co 4555  df-dm 4556  df-rn 4557  df-res 4558  df-ima 4559  df-iota 5095  df-fun 5132  df-fn 5133  df-f 5134  df-f1 5135  df-fo 5136  df-f1o 5137  df-fv 5138  df-riota 5737  df-ov 5784  df-oprab 5785  df-mpo 5786  df-1st 6045  df-2nd 6046  df-recs 6209  df-frec 6295  df-pnf 7825  df-mnf 7826  df-xr 7827  df-ltxr 7828  df-le 7829  df-sub 7958  df-neg 7959  df-reap 8360  df-ap 8367  df-div 8456  df-inn 8744  df-n0 9001  df-z 9078  df-uz 9350  df-q 9438  df-rp 9470  df-fl 10073  df-mod 10126  df-seqfrec 10249 This theorem is referenced by:  eucalg  11774
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