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Theorem tz6.12-afv 45881
Description: Function value. Theorem 6.12(1) of [TakeutiZaring] p. 27, analogous to tz6.12 6917. (Contributed by Alexander van der Vekens, 29-Nov-2017.)
Assertion
Ref Expression
tz6.12-afv ((⟨𝐴, 𝑦⟩ ∈ 𝐹 ∧ ∃!𝑦𝐴, 𝑦⟩ ∈ 𝐹) → (𝐹'''𝐴) = 𝑦)
Distinct variable groups:   𝑦,𝐴   𝑦,𝐹

Proof of Theorem tz6.12-afv
Dummy variable 𝑥 is distinct from all other variables.
StepHypRef Expression
1 simpl 484 . . . . . . . 8 ((𝐴 ∈ V ∧ ⟨𝐴, 𝑦⟩ ∈ 𝐹) → 𝐴 ∈ V)
2 vex 3479 . . . . . . . . 9 𝑦 ∈ V
32a1i 11 . . . . . . . 8 ((𝐴 ∈ V ∧ ⟨𝐴, 𝑦⟩ ∈ 𝐹) → 𝑦 ∈ V)
4 df-br 5150 . . . . . . . . . 10 (𝐴𝐹𝑦 ↔ ⟨𝐴, 𝑦⟩ ∈ 𝐹)
54biimpri 227 . . . . . . . . 9 (⟨𝐴, 𝑦⟩ ∈ 𝐹𝐴𝐹𝑦)
65adantl 483 . . . . . . . 8 ((𝐴 ∈ V ∧ ⟨𝐴, 𝑦⟩ ∈ 𝐹) → 𝐴𝐹𝑦)
7 breldmg 5910 . . . . . . . 8 ((𝐴 ∈ V ∧ 𝑦 ∈ V ∧ 𝐴𝐹𝑦) → 𝐴 ∈ dom 𝐹)
81, 3, 6, 7syl3anc 1372 . . . . . . 7 ((𝐴 ∈ V ∧ ⟨𝐴, 𝑦⟩ ∈ 𝐹) → 𝐴 ∈ dom 𝐹)
9 simpl 484 . . . . . . . . 9 ((𝐴 ∈ dom 𝐹 ∧ ∃!𝑦𝐴, 𝑦⟩ ∈ 𝐹) → 𝐴 ∈ dom 𝐹)
10 velsn 4645 . . . . . . . . . . . . . 14 (𝑥 ∈ {𝐴} ↔ 𝑥 = 𝐴)
11 breq1 5152 . . . . . . . . . . . . . . . . . 18 (𝐴 = 𝑥 → (𝐴𝐹𝑦𝑥𝐹𝑦))
124, 11bitr3id 285 . . . . . . . . . . . . . . . . 17 (𝐴 = 𝑥 → (⟨𝐴, 𝑦⟩ ∈ 𝐹𝑥𝐹𝑦))
1312eqcoms 2741 . . . . . . . . . . . . . . . 16 (𝑥 = 𝐴 → (⟨𝐴, 𝑦⟩ ∈ 𝐹𝑥𝐹𝑦))
1413eubidv 2581 . . . . . . . . . . . . . . 15 (𝑥 = 𝐴 → (∃!𝑦𝐴, 𝑦⟩ ∈ 𝐹 ↔ ∃!𝑦 𝑥𝐹𝑦))
1514biimpd 228 . . . . . . . . . . . . . 14 (𝑥 = 𝐴 → (∃!𝑦𝐴, 𝑦⟩ ∈ 𝐹 → ∃!𝑦 𝑥𝐹𝑦))
1610, 15sylbi 216 . . . . . . . . . . . . 13 (𝑥 ∈ {𝐴} → (∃!𝑦𝐴, 𝑦⟩ ∈ 𝐹 → ∃!𝑦 𝑥𝐹𝑦))
1716com12 32 . . . . . . . . . . . 12 (∃!𝑦𝐴, 𝑦⟩ ∈ 𝐹 → (𝑥 ∈ {𝐴} → ∃!𝑦 𝑥𝐹𝑦))
1817adantl 483 . . . . . . . . . . 11 ((𝐴 ∈ dom 𝐹 ∧ ∃!𝑦𝐴, 𝑦⟩ ∈ 𝐹) → (𝑥 ∈ {𝐴} → ∃!𝑦 𝑥𝐹𝑦))
1918ralrimiv 3146 . . . . . . . . . 10 ((𝐴 ∈ dom 𝐹 ∧ ∃!𝑦𝐴, 𝑦⟩ ∈ 𝐹) → ∀𝑥 ∈ {𝐴}∃!𝑦 𝑥𝐹𝑦)
20 fnres 6678 . . . . . . . . . . 11 ((𝐹 ↾ {𝐴}) Fn {𝐴} ↔ ∀𝑥 ∈ {𝐴}∃!𝑦 𝑥𝐹𝑦)
21 fnfun 6650 . . . . . . . . . . 11 ((𝐹 ↾ {𝐴}) Fn {𝐴} → Fun (𝐹 ↾ {𝐴}))
2220, 21sylbir 234 . . . . . . . . . 10 (∀𝑥 ∈ {𝐴}∃!𝑦 𝑥𝐹𝑦 → Fun (𝐹 ↾ {𝐴}))
2319, 22syl 17 . . . . . . . . 9 ((𝐴 ∈ dom 𝐹 ∧ ∃!𝑦𝐴, 𝑦⟩ ∈ 𝐹) → Fun (𝐹 ↾ {𝐴}))
249, 23jca 513 . . . . . . . 8 ((𝐴 ∈ dom 𝐹 ∧ ∃!𝑦𝐴, 𝑦⟩ ∈ 𝐹) → (𝐴 ∈ dom 𝐹 ∧ Fun (𝐹 ↾ {𝐴})))
2524ex 414 . . . . . . 7 (𝐴 ∈ dom 𝐹 → (∃!𝑦𝐴, 𝑦⟩ ∈ 𝐹 → (𝐴 ∈ dom 𝐹 ∧ Fun (𝐹 ↾ {𝐴}))))
268, 25syl 17 . . . . . 6 ((𝐴 ∈ V ∧ ⟨𝐴, 𝑦⟩ ∈ 𝐹) → (∃!𝑦𝐴, 𝑦⟩ ∈ 𝐹 → (𝐴 ∈ dom 𝐹 ∧ Fun (𝐹 ↾ {𝐴}))))
2726impr 456 . . . . 5 ((𝐴 ∈ V ∧ (⟨𝐴, 𝑦⟩ ∈ 𝐹 ∧ ∃!𝑦𝐴, 𝑦⟩ ∈ 𝐹)) → (𝐴 ∈ dom 𝐹 ∧ Fun (𝐹 ↾ {𝐴})))
28 df-dfat 45827 . . . . . 6 (𝐹 defAt 𝐴 ↔ (𝐴 ∈ dom 𝐹 ∧ Fun (𝐹 ↾ {𝐴})))
29 afvfundmfveq 45846 . . . . . 6 (𝐹 defAt 𝐴 → (𝐹'''𝐴) = (𝐹𝐴))
3028, 29sylbir 234 . . . . 5 ((𝐴 ∈ dom 𝐹 ∧ Fun (𝐹 ↾ {𝐴})) → (𝐹'''𝐴) = (𝐹𝐴))
3127, 30syl 17 . . . 4 ((𝐴 ∈ V ∧ (⟨𝐴, 𝑦⟩ ∈ 𝐹 ∧ ∃!𝑦𝐴, 𝑦⟩ ∈ 𝐹)) → (𝐹'''𝐴) = (𝐹𝐴))
32 tz6.12 6917 . . . . 5 ((⟨𝐴, 𝑦⟩ ∈ 𝐹 ∧ ∃!𝑦𝐴, 𝑦⟩ ∈ 𝐹) → (𝐹𝐴) = 𝑦)
3332adantl 483 . . . 4 ((𝐴 ∈ V ∧ (⟨𝐴, 𝑦⟩ ∈ 𝐹 ∧ ∃!𝑦𝐴, 𝑦⟩ ∈ 𝐹)) → (𝐹𝐴) = 𝑦)
3431, 33eqtrd 2773 . . 3 ((𝐴 ∈ V ∧ (⟨𝐴, 𝑦⟩ ∈ 𝐹 ∧ ∃!𝑦𝐴, 𝑦⟩ ∈ 𝐹)) → (𝐹'''𝐴) = 𝑦)
3534ex 414 . 2 (𝐴 ∈ V → ((⟨𝐴, 𝑦⟩ ∈ 𝐹 ∧ ∃!𝑦𝐴, 𝑦⟩ ∈ 𝐹) → (𝐹'''𝐴) = 𝑦))
36 eu2ndop1stv 45833 . . . . 5 (∃!𝑦𝐴, 𝑦⟩ ∈ 𝐹𝐴 ∈ V)
3736pm2.24d 151 . . . 4 (∃!𝑦𝐴, 𝑦⟩ ∈ 𝐹 → (¬ 𝐴 ∈ V → (𝐹'''𝐴) = 𝑦))
3837adantl 483 . . 3 ((⟨𝐴, 𝑦⟩ ∈ 𝐹 ∧ ∃!𝑦𝐴, 𝑦⟩ ∈ 𝐹) → (¬ 𝐴 ∈ V → (𝐹'''𝐴) = 𝑦))
3938com12 32 . 2 𝐴 ∈ V → ((⟨𝐴, 𝑦⟩ ∈ 𝐹 ∧ ∃!𝑦𝐴, 𝑦⟩ ∈ 𝐹) → (𝐹'''𝐴) = 𝑦))
4035, 39pm2.61i 182 1 ((⟨𝐴, 𝑦⟩ ∈ 𝐹 ∧ ∃!𝑦𝐴, 𝑦⟩ ∈ 𝐹) → (𝐹'''𝐴) = 𝑦)
Colors of variables: wff setvar class
Syntax hints:  ¬ wn 3  wi 4  wb 205  wa 397   = wceq 1542  wcel 2107  ∃!weu 2563  wral 3062  Vcvv 3475  {csn 4629  cop 4635   class class class wbr 5149  dom cdm 5677  cres 5679  Fun wfun 6538   Fn wfn 6539  cfv 6544   defAt wdfat 45824  '''cafv 45825
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1798  ax-4 1812  ax-5 1914  ax-6 1972  ax-7 2012  ax-8 2109  ax-9 2117  ax-10 2138  ax-11 2155  ax-12 2172  ax-ext 2704  ax-sep 5300  ax-nul 5307  ax-pow 5364  ax-pr 5428
This theorem depends on definitions:  df-bi 206  df-an 398  df-or 847  df-3an 1090  df-tru 1545  df-fal 1555  df-ex 1783  df-nf 1787  df-sb 2069  df-mo 2535  df-eu 2564  df-clab 2711  df-cleq 2725  df-clel 2811  df-nfc 2886  df-ne 2942  df-ral 3063  df-rex 3072  df-rab 3434  df-v 3477  df-sbc 3779  df-csb 3895  df-dif 3952  df-un 3954  df-in 3956  df-ss 3966  df-nul 4324  df-if 4530  df-sn 4630  df-pr 4632  df-op 4636  df-uni 4910  df-int 4952  df-br 5150  df-opab 5212  df-id 5575  df-xp 5683  df-rel 5684  df-cnv 5685  df-co 5686  df-dm 5687  df-res 5689  df-iota 6496  df-fun 6546  df-fn 6547  df-fv 6552  df-aiota 45793  df-dfat 45827  df-afv 45828
This theorem is referenced by:  tz6.12-1-afv  45882
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