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Theorem resfifsupp 9086
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 6435 . . . 4 (Fun 𝐹 → Rel 𝐹)
31, 2syl 17 . . 3 (𝜑 → Rel 𝐹)
4 resindm 5929 . . 3 (Rel 𝐹 → (𝐹 ↾ (𝑋 ∩ dom 𝐹)) = (𝐹𝑋))
53, 4syl 17 . 2 (𝜑 → (𝐹 ↾ (𝑋 ∩ dom 𝐹)) = (𝐹𝑋))
61funfnd 6449 . . . 4 (𝜑𝐹 Fn dom 𝐹)
7 fnresin2 6542 . . . 4 (𝐹 Fn dom 𝐹 → (𝐹 ↾ (𝑋 ∩ dom 𝐹)) Fn (𝑋 ∩ dom 𝐹))
86, 7syl 17 . . 3 (𝜑 → (𝐹 ↾ (𝑋 ∩ dom 𝐹)) Fn (𝑋 ∩ dom 𝐹))
9 resfifsupp.x . . . 4 (𝜑𝑋 ∈ Fin)
10 infi 8972 . . . 4 (𝑋 ∈ Fin → (𝑋 ∩ dom 𝐹) ∈ Fin)
119, 10syl 17 . . 3 (𝜑 → (𝑋 ∩ dom 𝐹) ∈ Fin)
12 resfifsupp.z . . 3 (𝜑𝑍𝑉)
138, 11, 12fndmfifsupp 9071 . 2 (𝜑 → (𝐹 ↾ (𝑋 ∩ dom 𝐹)) finSupp 𝑍)
145, 13eqbrtrrd 5094 1 (𝜑 → (𝐹𝑋) finSupp 𝑍)
Colors of variables: wff setvar class
Syntax hints:  wi 4   = wceq 1539  wcel 2108  cin 3882   class class class wbr 5070  dom cdm 5580  cres 5582  Rel wrel 5585  Fun wfun 6412   Fn wfn 6413  Fincfn 8691   finSupp cfsupp 9058
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1799  ax-4 1813  ax-5 1914  ax-6 1972  ax-7 2012  ax-8 2110  ax-9 2118  ax-10 2139  ax-11 2156  ax-12 2173  ax-ext 2709  ax-rep 5205  ax-sep 5218  ax-nul 5225  ax-pr 5347  ax-un 7566
This theorem depends on definitions:  df-bi 206  df-an 396  df-or 844  df-3or 1086  df-3an 1087  df-tru 1542  df-fal 1552  df-ex 1784  df-nf 1788  df-sb 2069  df-mo 2540  df-eu 2569  df-clab 2716  df-cleq 2730  df-clel 2817  df-nfc 2888  df-ne 2943  df-ral 3068  df-rex 3069  df-reu 3070  df-rab 3072  df-v 3424  df-sbc 3712  df-csb 3829  df-dif 3886  df-un 3888  df-in 3890  df-ss 3900  df-pss 3902  df-nul 4254  df-if 4457  df-pw 4532  df-sn 4559  df-pr 4561  df-tp 4563  df-op 4565  df-uni 4837  df-iun 4923  df-br 5071  df-opab 5133  df-mpt 5154  df-tr 5188  df-id 5480  df-eprel 5486  df-po 5494  df-so 5495  df-fr 5535  df-we 5537  df-xp 5586  df-rel 5587  df-cnv 5588  df-co 5589  df-dm 5590  df-rn 5591  df-res 5592  df-ima 5593  df-ord 6254  df-on 6255  df-lim 6256  df-suc 6257  df-iota 6376  df-fun 6420  df-fn 6421  df-f 6422  df-f1 6423  df-fo 6424  df-f1o 6425  df-fv 6426  df-ov 7258  df-oprab 7259  df-mpo 7260  df-om 7688  df-supp 7949  df-1o 8267  df-en 8692  df-fin 8695  df-fsupp 9059
This theorem is referenced by:  xrge0tsmsd  31219
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