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Theorem fnbrafvb 41555
Description: Equivalence of function value and binary relation, analogous to fnbrfvb 6274. (Contributed by Alexander van der Vekens, 25-May-2017.)
Assertion
Ref Expression
fnbrafvb ((𝐹 Fn 𝐴𝐵𝐴) → ((𝐹'''𝐵) = 𝐶𝐵𝐹𝐶))

Proof of Theorem fnbrafvb
StepHypRef Expression
1 fndm 6028 . . . . . 6 (𝐹 Fn 𝐴 → dom 𝐹 = 𝐴)
2 eleq2 2719 . . . . . . . 8 (𝐴 = dom 𝐹 → (𝐵𝐴𝐵 ∈ dom 𝐹))
32eqcoms 2659 . . . . . . 7 (dom 𝐹 = 𝐴 → (𝐵𝐴𝐵 ∈ dom 𝐹))
43biimpd 219 . . . . . 6 (dom 𝐹 = 𝐴 → (𝐵𝐴𝐵 ∈ dom 𝐹))
51, 4syl 17 . . . . 5 (𝐹 Fn 𝐴 → (𝐵𝐴𝐵 ∈ dom 𝐹))
65imp 444 . . . 4 ((𝐹 Fn 𝐴𝐵𝐴) → 𝐵 ∈ dom 𝐹)
7 snssi 4371 . . . . . . 7 (𝐵𝐴 → {𝐵} ⊆ 𝐴)
87adantl 481 . . . . . 6 ((𝐹 Fn 𝐴𝐵𝐴) → {𝐵} ⊆ 𝐴)
9 fnssresb 6041 . . . . . . 7 (𝐹 Fn 𝐴 → ((𝐹 ↾ {𝐵}) Fn {𝐵} ↔ {𝐵} ⊆ 𝐴))
109adantr 480 . . . . . 6 ((𝐹 Fn 𝐴𝐵𝐴) → ((𝐹 ↾ {𝐵}) Fn {𝐵} ↔ {𝐵} ⊆ 𝐴))
118, 10mpbird 247 . . . . 5 ((𝐹 Fn 𝐴𝐵𝐴) → (𝐹 ↾ {𝐵}) Fn {𝐵})
12 fnfun 6026 . . . . 5 ((𝐹 ↾ {𝐵}) Fn {𝐵} → Fun (𝐹 ↾ {𝐵}))
1311, 12syl 17 . . . 4 ((𝐹 Fn 𝐴𝐵𝐴) → Fun (𝐹 ↾ {𝐵}))
14 df-dfat 41517 . . . . 5 (𝐹 defAt 𝐵 ↔ (𝐵 ∈ dom 𝐹 ∧ Fun (𝐹 ↾ {𝐵})))
15 afvfundmfveq 41539 . . . . 5 (𝐹 defAt 𝐵 → (𝐹'''𝐵) = (𝐹𝐵))
1614, 15sylbir 225 . . . 4 ((𝐵 ∈ dom 𝐹 ∧ Fun (𝐹 ↾ {𝐵})) → (𝐹'''𝐵) = (𝐹𝐵))
176, 13, 16syl2anc 694 . . 3 ((𝐹 Fn 𝐴𝐵𝐴) → (𝐹'''𝐵) = (𝐹𝐵))
1817eqeq1d 2653 . 2 ((𝐹 Fn 𝐴𝐵𝐴) → ((𝐹'''𝐵) = 𝐶 ↔ (𝐹𝐵) = 𝐶))
19 fnbrfvb 6274 . 2 ((𝐹 Fn 𝐴𝐵𝐴) → ((𝐹𝐵) = 𝐶𝐵𝐹𝐶))
2018, 19bitrd 268 1 ((𝐹 Fn 𝐴𝐵𝐴) → ((𝐹'''𝐵) = 𝐶𝐵𝐹𝐶))
Colors of variables: wff setvar class
Syntax hints:  wi 4  wb 196  wa 383   = wceq 1523  wcel 2030  wss 3607  {csn 4210   class class class wbr 4685  dom cdm 5143  cres 5145  Fun wfun 5920   Fn wfn 5921  cfv 5926   defAt wdfat 41514  '''cafv 41515
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1762  ax-4 1777  ax-5 1879  ax-6 1945  ax-7 1981  ax-9 2039  ax-10 2059  ax-11 2074  ax-12 2087  ax-13 2282  ax-ext 2631  ax-sep 4814  ax-nul 4822  ax-pr 4936
This theorem depends on definitions:  df-bi 197  df-or 384  df-an 385  df-3an 1056  df-tru 1526  df-ex 1745  df-nf 1750  df-sb 1938  df-eu 2502  df-mo 2503  df-clab 2638  df-cleq 2644  df-clel 2647  df-nfc 2782  df-ral 2946  df-rex 2947  df-rab 2950  df-v 3233  df-sbc 3469  df-dif 3610  df-un 3612  df-in 3614  df-ss 3621  df-nul 3949  df-if 4120  df-sn 4211  df-pr 4213  df-op 4217  df-uni 4469  df-br 4686  df-opab 4746  df-id 5053  df-xp 5149  df-rel 5150  df-cnv 5151  df-co 5152  df-dm 5153  df-res 5155  df-iota 5889  df-fun 5928  df-fn 5929  df-fv 5934  df-dfat 41517  df-afv 41518
This theorem is referenced by:  fnopafvb  41556  funbrafvb  41557  dfafn5a  41561
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