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Theorem dff3im 5732
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 5449 . 2 (𝐹:𝐴𝐵𝐹 ⊆ (𝐴 × 𝐵))
2 ffun 5434 . . . . . . . 8 (𝐹:𝐴𝐵 → Fun 𝐹)
32adantr 276 . . . . . . 7 ((𝐹:𝐴𝐵𝑥𝐴) → Fun 𝐹)
4 fdm 5437 . . . . . . . . 9 (𝐹:𝐴𝐵 → dom 𝐹 = 𝐴)
54eleq2d 2276 . . . . . . . 8 (𝐹:𝐴𝐵 → (𝑥 ∈ dom 𝐹𝑥𝐴))
65biimpar 297 . . . . . . 7 ((𝐹:𝐴𝐵𝑥𝐴) → 𝑥 ∈ dom 𝐹)
7 funfvop 5699 . . . . . . 7 ((Fun 𝐹𝑥 ∈ dom 𝐹) → ⟨𝑥, (𝐹𝑥)⟩ ∈ 𝐹)
83, 6, 7syl2anc 411 . . . . . 6 ((𝐹:𝐴𝐵𝑥𝐴) → ⟨𝑥, (𝐹𝑥)⟩ ∈ 𝐹)
9 df-br 4048 . . . . . 6 (𝑥𝐹(𝐹𝑥) ↔ ⟨𝑥, (𝐹𝑥)⟩ ∈ 𝐹)
108, 9sylibr 134 . . . . 5 ((𝐹:𝐴𝐵𝑥𝐴) → 𝑥𝐹(𝐹𝑥))
11 funfvex 5600 . . . . . . 7 ((Fun 𝐹𝑥 ∈ dom 𝐹) → (𝐹𝑥) ∈ V)
12 breq2 4051 . . . . . . . 8 (𝑦 = (𝐹𝑥) → (𝑥𝐹𝑦𝑥𝐹(𝐹𝑥)))
1312spcegv 2862 . . . . . . 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 5291 . . . . . 6 (Fun 𝐹 → ∃*𝑦 𝑥𝐹𝑦)
182, 17syl 14 . . . . 5 (𝐹:𝐴𝐵 → ∃*𝑦 𝑥𝐹𝑦)
1918adantr 276 . . . 4 ((𝐹:𝐴𝐵𝑥𝐴) → ∃*𝑦 𝑥𝐹𝑦)
20 eu5 2102 . . . 4 (∃!𝑦 𝑥𝐹𝑦 ↔ (∃𝑦 𝑥𝐹𝑦 ∧ ∃*𝑦 𝑥𝐹𝑦))
2116, 19, 20sylanbrc 417 . . 3 ((𝐹:𝐴𝐵𝑥𝐴) → ∃!𝑦 𝑥𝐹𝑦)
2221ralrimiva 2580 . 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 1516  ∃!weu 2055  ∃*wmo 2056  wcel 2177  wral 2485  Vcvv 2773  wss 3167  cop 3637   class class class wbr 4047   × cxp 4677  dom cdm 4679  Fun wfun 5270  wf 5272  cfv 5276
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 711  ax-5 1471  ax-7 1472  ax-gen 1473  ax-ie1 1517  ax-ie2 1518  ax-8 1528  ax-10 1529  ax-11 1530  ax-i12 1531  ax-bndl 1533  ax-4 1534  ax-17 1550  ax-i9 1554  ax-ial 1558  ax-i5r 1559  ax-14 2180  ax-ext 2188  ax-sep 4166  ax-pow 4222  ax-pr 4257
This theorem depends on definitions:  df-bi 117  df-3an 983  df-tru 1376  df-nf 1485  df-sb 1787  df-eu 2058  df-mo 2059  df-clab 2193  df-cleq 2199  df-clel 2202  df-nfc 2338  df-ral 2490  df-rex 2491  df-v 2775  df-sbc 3000  df-un 3171  df-in 3173  df-ss 3180  df-pw 3619  df-sn 3640  df-pr 3641  df-op 3643  df-uni 3853  df-br 4048  df-opab 4110  df-id 4344  df-xp 4685  df-rel 4686  df-cnv 4687  df-co 4688  df-dm 4689  df-rn 4690  df-iota 5237  df-fun 5278  df-fn 5279  df-f 5280  df-fv 5284
This theorem is referenced by:  dff4im  5733
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