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Theorem dff3im 5710
Description: Property of a mapping. (Contributed by Jim Kingdon, 4-Jan-2019.)
Assertion
Ref Expression
dff3im (𝐹:𝐴𝐵 → (𝐹 ⊆ (𝐴 × 𝐵) ∧ ∀𝑥𝐴 ∃!𝑦 𝑥𝐹𝑦))
Distinct variable groups:   𝑥,𝑦,𝐴   𝑥,𝐵,𝑦   𝑥,𝐹,𝑦

Proof of Theorem dff3im
StepHypRef Expression
1 fssxp 5428 . 2 (𝐹:𝐴𝐵𝐹 ⊆ (𝐴 × 𝐵))
2 ffun 5413 . . . . . . . 8 (𝐹:𝐴𝐵 → Fun 𝐹)
32adantr 276 . . . . . . 7 ((𝐹:𝐴𝐵𝑥𝐴) → Fun 𝐹)
4 fdm 5416 . . . . . . . . 9 (𝐹:𝐴𝐵 → dom 𝐹 = 𝐴)
54eleq2d 2266 . . . . . . . 8 (𝐹:𝐴𝐵 → (𝑥 ∈ dom 𝐹𝑥𝐴))
65biimpar 297 . . . . . . 7 ((𝐹:𝐴𝐵𝑥𝐴) → 𝑥 ∈ dom 𝐹)
7 funfvop 5677 . . . . . . 7 ((Fun 𝐹𝑥 ∈ dom 𝐹) → ⟨𝑥, (𝐹𝑥)⟩ ∈ 𝐹)
83, 6, 7syl2anc 411 . . . . . 6 ((𝐹:𝐴𝐵𝑥𝐴) → ⟨𝑥, (𝐹𝑥)⟩ ∈ 𝐹)
9 df-br 4035 . . . . . 6 (𝑥𝐹(𝐹𝑥) ↔ ⟨𝑥, (𝐹𝑥)⟩ ∈ 𝐹)
108, 9sylibr 134 . . . . 5 ((𝐹:𝐴𝐵𝑥𝐴) → 𝑥𝐹(𝐹𝑥))
11 funfvex 5578 . . . . . . 7 ((Fun 𝐹𝑥 ∈ dom 𝐹) → (𝐹𝑥) ∈ V)
12 breq2 4038 . . . . . . . 8 (𝑦 = (𝐹𝑥) → (𝑥𝐹𝑦𝑥𝐹(𝐹𝑥)))
1312spcegv 2852 . . . . . . 7 ((𝐹𝑥) ∈ V → (𝑥𝐹(𝐹𝑥) → ∃𝑦 𝑥𝐹𝑦))
1411, 13syl 14 . . . . . 6 ((Fun 𝐹𝑥 ∈ dom 𝐹) → (𝑥𝐹(𝐹𝑥) → ∃𝑦 𝑥𝐹𝑦))
153, 6, 14syl2anc 411 . . . . 5 ((𝐹:𝐴𝐵𝑥𝐴) → (𝑥𝐹(𝐹𝑥) → ∃𝑦 𝑥𝐹𝑦))
1610, 15mpd 13 . . . 4 ((𝐹:𝐴𝐵𝑥𝐴) → ∃𝑦 𝑥𝐹𝑦)
17 funmo 5274 . . . . . 6 (Fun 𝐹 → ∃*𝑦 𝑥𝐹𝑦)
182, 17syl 14 . . . . 5 (𝐹:𝐴𝐵 → ∃*𝑦 𝑥𝐹𝑦)
1918adantr 276 . . . 4 ((𝐹:𝐴𝐵𝑥𝐴) → ∃*𝑦 𝑥𝐹𝑦)
20 eu5 2092 . . . 4 (∃!𝑦 𝑥𝐹𝑦 ↔ (∃𝑦 𝑥𝐹𝑦 ∧ ∃*𝑦 𝑥𝐹𝑦))
2116, 19, 20sylanbrc 417 . . 3 ((𝐹:𝐴𝐵𝑥𝐴) → ∃!𝑦 𝑥𝐹𝑦)
2221ralrimiva 2570 . 2 (𝐹:𝐴𝐵 → ∀𝑥𝐴 ∃!𝑦 𝑥𝐹𝑦)
231, 22jca 306 1 (𝐹:𝐴𝐵 → (𝐹 ⊆ (𝐴 × 𝐵) ∧ ∀𝑥𝐴 ∃!𝑦 𝑥𝐹𝑦))
Colors of variables: wff set class
Syntax hints:  wi 4  wa 104  wex 1506  ∃!weu 2045  ∃*wmo 2046  wcel 2167  wral 2475  Vcvv 2763  wss 3157  cop 3626   class class class wbr 4034   × cxp 4662  dom cdm 4664  Fun wfun 5253  wf 5255  cfv 5259
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 1461  ax-7 1462  ax-gen 1463  ax-ie1 1507  ax-ie2 1508  ax-8 1518  ax-10 1519  ax-11 1520  ax-i12 1521  ax-bndl 1523  ax-4 1524  ax-17 1540  ax-i9 1544  ax-ial 1548  ax-i5r 1549  ax-14 2170  ax-ext 2178  ax-sep 4152  ax-pow 4208  ax-pr 4243
This theorem depends on definitions:  df-bi 117  df-3an 982  df-tru 1367  df-nf 1475  df-sb 1777  df-eu 2048  df-mo 2049  df-clab 2183  df-cleq 2189  df-clel 2192  df-nfc 2328  df-ral 2480  df-rex 2481  df-v 2765  df-sbc 2990  df-un 3161  df-in 3163  df-ss 3170  df-pw 3608  df-sn 3629  df-pr 3630  df-op 3632  df-uni 3841  df-br 4035  df-opab 4096  df-id 4329  df-xp 4670  df-rel 4671  df-cnv 4672  df-co 4673  df-dm 4674  df-rn 4675  df-iota 5220  df-fun 5261  df-fn 5262  df-f 5263  df-fv 5267
This theorem is referenced by:  dff4im  5711
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