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Theorem fun2d 6535
Description: The union of functions with disjoint domains is a function, deduction version of fun2 6534. (Contributed by AV, 11-Oct-2020.) (Revised by AV, 24-Oct-2021.)
Hypotheses
Ref Expression
fun2d.f (𝜑𝐹:𝐴𝐶)
fun2d.g (𝜑𝐺:𝐵𝐶)
fun2d.i (𝜑 → (𝐴𝐵) = ∅)
Assertion
Ref Expression
fun2d (𝜑 → (𝐹𝐺):(𝐴𝐵)⟶𝐶)

Proof of Theorem fun2d
StepHypRef Expression
1 fun2d.f . 2 (𝜑𝐹:𝐴𝐶)
2 fun2d.g . 2 (𝜑𝐺:𝐵𝐶)
3 fun2d.i . 2 (𝜑 → (𝐴𝐵) = ∅)
4 fun2 6534 . 2 (((𝐹:𝐴𝐶𝐺:𝐵𝐶) ∧ (𝐴𝐵) = ∅) → (𝐹𝐺):(𝐴𝐵)⟶𝐶)
51, 2, 3, 4syl21anc 833 1 (𝜑 → (𝐹𝐺):(𝐴𝐵)⟶𝐶)
Colors of variables: wff setvar class
Syntax hints:  wi 4   = wceq 1528  cun 3931  cin 3932  c0 4288  wf 6344
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1787  ax-4 1801  ax-5 1902  ax-6 1961  ax-7 2006  ax-8 2107  ax-9 2115  ax-10 2136  ax-11 2151  ax-12 2167  ax-ext 2790  ax-sep 5194  ax-nul 5201  ax-pr 5320
This theorem depends on definitions:  df-bi 208  df-an 397  df-or 842  df-3an 1081  df-tru 1531  df-ex 1772  df-nf 1776  df-sb 2061  df-mo 2615  df-eu 2647  df-clab 2797  df-cleq 2811  df-clel 2890  df-nfc 2960  df-ral 3140  df-rab 3144  df-v 3494  df-dif 3936  df-un 3938  df-in 3940  df-ss 3949  df-nul 4289  df-if 4464  df-sn 4558  df-pr 4560  df-op 4564  df-br 5058  df-opab 5120  df-id 5453  df-rel 5555  df-cnv 5556  df-co 5557  df-dm 5558  df-rn 5559  df-fun 6350  df-fn 6351  df-f 6352
This theorem is referenced by:  fresaun  6542  mapunen  8674  ac6sfi  8750  axdc3lem4  9863  fseq1p1m1  12969  uhgrun  26786  upgrun  26830  umgrun  26832  lbsdiflsp0  30921  reprsuc  31785
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