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Theorem resfifsupp 8186
Description: The restriction of a function to a finite set is finitely supported. (Contributed by AV, 12-Dec-2019.)
Hypotheses
Ref Expression
resfifsupp.f (𝜑 → Fun 𝐹)
resfifsupp.x (𝜑𝑋 ∈ Fin)
resfifsupp.z (𝜑𝑍𝑉)
Assertion
Ref Expression
resfifsupp (𝜑 → (𝐹𝑋) finSupp 𝑍)

Proof of Theorem resfifsupp
StepHypRef Expression
1 resfifsupp.f . . . 4 (𝜑 → Fun 𝐹)
2 funrel 5821 . . . 4 (Fun 𝐹 → Rel 𝐹)
31, 2syl 17 . . 3 (𝜑 → Rel 𝐹)
4 resindm 5364 . . 3 (Rel 𝐹 → (𝐹 ↾ (𝑋 ∩ dom 𝐹)) = (𝐹𝑋))
53, 4syl 17 . 2 (𝜑 → (𝐹 ↾ (𝑋 ∩ dom 𝐹)) = (𝐹𝑋))
6 funfn 5833 . . . . 5 (Fun 𝐹𝐹 Fn dom 𝐹)
71, 6sylib 207 . . . 4 (𝜑𝐹 Fn dom 𝐹)
8 fnresin2 5920 . . . 4 (𝐹 Fn dom 𝐹 → (𝐹 ↾ (𝑋 ∩ dom 𝐹)) Fn (𝑋 ∩ dom 𝐹))
97, 8syl 17 . . 3 (𝜑 → (𝐹 ↾ (𝑋 ∩ dom 𝐹)) Fn (𝑋 ∩ dom 𝐹))
10 resfifsupp.x . . . 4 (𝜑𝑋 ∈ Fin)
11 infi 8069 . . . 4 (𝑋 ∈ Fin → (𝑋 ∩ dom 𝐹) ∈ Fin)
1210, 11syl 17 . . 3 (𝜑 → (𝑋 ∩ dom 𝐹) ∈ Fin)
13 resfifsupp.z . . 3 (𝜑𝑍𝑉)
149, 12, 13fndmfifsupp 8171 . 2 (𝜑 → (𝐹 ↾ (𝑋 ∩ dom 𝐹)) finSupp 𝑍)
155, 14eqbrtrrd 4607 1 (𝜑 → (𝐹𝑋) finSupp 𝑍)
Colors of variables: wff setvar class
Syntax hints:  wi 4   = wceq 1475  wcel 1977  cin 3539   class class class wbr 4583  dom cdm 5038  cres 5040  Rel wrel 5043  Fun wfun 5798   Fn wfn 5799  Fincfn 7841   finSupp cfsupp 8158
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1713  ax-4 1728  ax-5 1827  ax-6 1875  ax-7 1922  ax-8 1979  ax-9 1986  ax-10 2006  ax-11 2021  ax-12 2034  ax-13 2234  ax-ext 2590  ax-rep 4699  ax-sep 4709  ax-nul 4717  ax-pow 4769  ax-pr 4833  ax-un 6847
This theorem depends on definitions:  df-bi 196  df-or 384  df-an 385  df-3or 1032  df-3an 1033  df-tru 1478  df-ex 1696  df-nf 1701  df-sb 1868  df-eu 2462  df-mo 2463  df-clab 2597  df-cleq 2603  df-clel 2606  df-nfc 2740  df-ne 2782  df-ral 2901  df-rex 2902  df-reu 2903  df-rab 2905  df-v 3175  df-sbc 3403  df-csb 3500  df-dif 3543  df-un 3545  df-in 3547  df-ss 3554  df-pss 3556  df-nul 3875  df-if 4037  df-pw 4110  df-sn 4126  df-pr 4128  df-tp 4130  df-op 4132  df-uni 4373  df-iun 4457  df-br 4584  df-opab 4644  df-mpt 4645  df-tr 4681  df-eprel 4949  df-id 4953  df-po 4959  df-so 4960  df-fr 4997  df-we 4999  df-xp 5044  df-rel 5045  df-cnv 5046  df-co 5047  df-dm 5048  df-rn 5049  df-res 5050  df-ima 5051  df-ord 5643  df-on 5644  df-lim 5645  df-suc 5646  df-iota 5768  df-fun 5806  df-fn 5807  df-f 5808  df-f1 5809  df-fo 5810  df-f1o 5811  df-fv 5812  df-ov 6552  df-oprab 6553  df-mpt2 6554  df-om 6958  df-supp 7183  df-er 7629  df-en 7842  df-fin 7845  df-fsupp 8159
This theorem is referenced by:  xrge0tsmsd  29116
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