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Theorem ressuppfi 8245
 Description: If the support of the restriction of a function by a set which, subtracted from the domain of the function so that its difference is finite, the support of the function itself is finite. (Contributed by AV, 22-Apr-2019.)
Hypotheses
Ref Expression
ressuppfi.b (𝜑 → (dom 𝐹𝐵) ∈ Fin)
ressuppfi.f (𝜑𝐹𝑊)
ressuppfi.g (𝜑𝐺 = (𝐹𝐵))
ressuppfi.s (𝜑 → (𝐺 supp 𝑍) ∈ Fin)
ressuppfi.z (𝜑𝑍𝑉)
Assertion
Ref Expression
ressuppfi (𝜑 → (𝐹 supp 𝑍) ∈ Fin)

Proof of Theorem ressuppfi
StepHypRef Expression
1 ressuppfi.g . . . . . 6 (𝜑𝐺 = (𝐹𝐵))
21eqcomd 2627 . . . . 5 (𝜑 → (𝐹𝐵) = 𝐺)
32oveq1d 6619 . . . 4 (𝜑 → ((𝐹𝐵) supp 𝑍) = (𝐺 supp 𝑍))
4 ressuppfi.s . . . 4 (𝜑 → (𝐺 supp 𝑍) ∈ Fin)
53, 4eqeltrd 2698 . . 3 (𝜑 → ((𝐹𝐵) supp 𝑍) ∈ Fin)
6 ressuppfi.b . . 3 (𝜑 → (dom 𝐹𝐵) ∈ Fin)
7 unfi 8171 . . 3 ((((𝐹𝐵) supp 𝑍) ∈ Fin ∧ (dom 𝐹𝐵) ∈ Fin) → (((𝐹𝐵) supp 𝑍) ∪ (dom 𝐹𝐵)) ∈ Fin)
85, 6, 7syl2anc 692 . 2 (𝜑 → (((𝐹𝐵) supp 𝑍) ∪ (dom 𝐹𝐵)) ∈ Fin)
9 ressuppfi.f . . 3 (𝜑𝐹𝑊)
10 ressuppfi.z . . 3 (𝜑𝑍𝑉)
11 ressuppssdif 7261 . . 3 ((𝐹𝑊𝑍𝑉) → (𝐹 supp 𝑍) ⊆ (((𝐹𝐵) supp 𝑍) ∪ (dom 𝐹𝐵)))
129, 10, 11syl2anc 692 . 2 (𝜑 → (𝐹 supp 𝑍) ⊆ (((𝐹𝐵) supp 𝑍) ∪ (dom 𝐹𝐵)))
13 ssfi 8124 . 2 (((((𝐹𝐵) supp 𝑍) ∪ (dom 𝐹𝐵)) ∈ Fin ∧ (𝐹 supp 𝑍) ⊆ (((𝐹𝐵) supp 𝑍) ∪ (dom 𝐹𝐵))) → (𝐹 supp 𝑍) ∈ Fin)
148, 12, 13syl2anc 692 1 (𝜑 → (𝐹 supp 𝑍) ∈ Fin)
 Colors of variables: wff setvar class Syntax hints:   → wi 4   = wceq 1480   ∈ wcel 1987   ∖ cdif 3552   ∪ cun 3553   ⊆ wss 3555  dom cdm 5074   ↾ cres 5076  (class class class)co 6604   supp csupp 7240  Fincfn 7899 This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1719  ax-4 1734  ax-5 1836  ax-6 1885  ax-7 1932  ax-8 1989  ax-9 1996  ax-10 2016  ax-11 2031  ax-12 2044  ax-13 2245  ax-ext 2601  ax-sep 4741  ax-nul 4749  ax-pow 4803  ax-pr 4867  ax-un 6902 This theorem depends on definitions:  df-bi 197  df-or 385  df-an 386  df-3or 1037  df-3an 1038  df-tru 1483  df-ex 1702  df-nf 1707  df-sb 1878  df-eu 2473  df-mo 2474  df-clab 2608  df-cleq 2614  df-clel 2617  df-nfc 2750  df-ne 2791  df-ral 2912  df-rex 2913  df-reu 2914  df-rab 2916  df-v 3188  df-sbc 3418  df-csb 3515  df-dif 3558  df-un 3560  df-in 3562  df-ss 3569  df-pss 3571  df-nul 3892  df-if 4059  df-pw 4132  df-sn 4149  df-pr 4151  df-tp 4153  df-op 4155  df-uni 4403  df-int 4441  df-iun 4487  df-br 4614  df-opab 4674  df-mpt 4675  df-tr 4713  df-eprel 4985  df-id 4989  df-po 4995  df-so 4996  df-fr 5033  df-we 5035  df-xp 5080  df-rel 5081  df-cnv 5082  df-co 5083  df-dm 5084  df-rn 5085  df-res 5086  df-ima 5087  df-pred 5639  df-ord 5685  df-on 5686  df-lim 5687  df-suc 5688  df-iota 5810  df-fun 5849  df-fn 5850  df-f 5851  df-f1 5852  df-fo 5853  df-f1o 5854  df-fv 5855  df-ov 6607  df-oprab 6608  df-mpt2 6609  df-om 7013  df-supp 7241  df-wrecs 7352  df-recs 7413  df-rdg 7451  df-oadd 7509  df-er 7687  df-en 7900  df-fin 7903 This theorem is referenced by:  resfsupp  8246
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