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Theorem funbrfv2b 5601
Description: Function value in terms of a binary relation. (Contributed by Mario Carneiro, 19-Mar-2014.)
Assertion
Ref Expression
funbrfv2b (Fun 𝐹 → (𝐴𝐹𝐵 ↔ (𝐴 ∈ dom 𝐹 ∧ (𝐹𝐴) = 𝐵)))

Proof of Theorem funbrfv2b
StepHypRef Expression
1 funrel 5271 . . . 4 (Fun 𝐹 → Rel 𝐹)
2 releldm 4897 . . . . 5 ((Rel 𝐹𝐴𝐹𝐵) → 𝐴 ∈ dom 𝐹)
32ex 115 . . . 4 (Rel 𝐹 → (𝐴𝐹𝐵𝐴 ∈ dom 𝐹))
41, 3syl 14 . . 3 (Fun 𝐹 → (𝐴𝐹𝐵𝐴 ∈ dom 𝐹))
54pm4.71rd 394 . 2 (Fun 𝐹 → (𝐴𝐹𝐵 ↔ (𝐴 ∈ dom 𝐹𝐴𝐹𝐵)))
6 funbrfvb 5599 . . 3 ((Fun 𝐹𝐴 ∈ dom 𝐹) → ((𝐹𝐴) = 𝐵𝐴𝐹𝐵))
76pm5.32da 452 . 2 (Fun 𝐹 → ((𝐴 ∈ dom 𝐹 ∧ (𝐹𝐴) = 𝐵) ↔ (𝐴 ∈ dom 𝐹𝐴𝐹𝐵)))
85, 7bitr4d 191 1 (Fun 𝐹 → (𝐴𝐹𝐵 ↔ (𝐴 ∈ dom 𝐹 ∧ (𝐹𝐴) = 𝐵)))
Colors of variables: wff set class
Syntax hints:  wi 4  wa 104  wb 105   = wceq 1364  wcel 2164   class class class wbr 4029  dom cdm 4659  Rel wrel 4664  Fun wfun 5248  cfv 5254
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-io 710  ax-5 1458  ax-7 1459  ax-gen 1460  ax-ie1 1504  ax-ie2 1505  ax-8 1515  ax-10 1516  ax-11 1517  ax-i12 1518  ax-bndl 1520  ax-4 1521  ax-17 1537  ax-i9 1541  ax-ial 1545  ax-i5r 1546  ax-14 2167  ax-ext 2175  ax-sep 4147  ax-pow 4203  ax-pr 4238
This theorem depends on definitions:  df-bi 117  df-3an 982  df-tru 1367  df-nf 1472  df-sb 1774  df-eu 2045  df-mo 2046  df-clab 2180  df-cleq 2186  df-clel 2189  df-nfc 2325  df-ral 2477  df-rex 2478  df-v 2762  df-sbc 2986  df-un 3157  df-in 3159  df-ss 3166  df-pw 3603  df-sn 3624  df-pr 3625  df-op 3627  df-uni 3836  df-br 4030  df-opab 4091  df-id 4324  df-xp 4665  df-rel 4666  df-cnv 4667  df-co 4668  df-dm 4669  df-iota 5215  df-fun 5256  df-fn 5257  df-fv 5262
This theorem is referenced by:  brtpos2  6304  xpcomco  6880
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