Theorem resfsupp 9297

Description: If the restriction of a function by a set which, subtracted from the domain of the function so that its difference is finitely supported, the function itself is finitely supported. (Contributed by AV, 27-May-2019.)

Hypotheses

Ref	Expression
resfsupp.b	⊢ (𝜑 → (dom 𝐹 ∖ 𝐵) ∈ Fin)
resfsupp.e	⊢ (𝜑 → 𝐹 ∈ 𝑊)
resfsupp.f	⊢ (𝜑 → Fun 𝐹)
resfsupp.g	⊢ (𝜑 → 𝐺 = (𝐹 ↾ 𝐵))
resfsupp.s	⊢ (𝜑 → 𝐺 finSupp 𝑍)
resfsupp.z	⊢ (𝜑 → 𝑍 ∈ 𝑉)

Assertion

Ref	Expression
resfsupp	⊢ (𝜑 → 𝐹 finSupp 𝑍)

Proof of Theorem resfsupp

Step	Hyp	Ref	Expression
1		resfsupp.b	. . 3 ⊢ (𝜑 → (dom 𝐹 ∖ 𝐵) ∈ Fin)
2		resfsupp.e	. . 3 ⊢ (𝜑 → 𝐹 ∈ 𝑊)
3		resfsupp.g	. . 3 ⊢ (𝜑 → 𝐺 = (𝐹 ↾ 𝐵))
4		resfsupp.s	. . . 4 ⊢ (𝜑 → 𝐺 finSupp 𝑍)
5	4	fsuppimpd 9270	. . 3 ⊢ (𝜑 → (𝐺 supp 𝑍) ∈ Fin)
6		resfsupp.z	. . 3 ⊢ (𝜑 → 𝑍 ∈ 𝑉)
7	1, 2, 3, 5, 6	ressuppfi 9296	. 2 ⊢ (𝜑 → (𝐹 supp 𝑍) ∈ Fin)
8		resfsupp.f	. . 3 ⊢ (𝜑 → Fun 𝐹)
9		funisfsupp 9268	. . 3 ⊢ ((Fun 𝐹 ∧ 𝐹 ∈ 𝑊 ∧ 𝑍 ∈ 𝑉) → (𝐹 finSupp 𝑍 ↔ (𝐹 supp 𝑍) ∈ Fin))
10	8, 2, 6, 9	syl3anc 1373	. 2 ⊢ (𝜑 → (𝐹 finSupp 𝑍 ↔ (𝐹 supp 𝑍) ∈ Fin))
11	7, 10	mpbird 257	1 ⊢ (𝜑 → 𝐹 finSupp 𝑍)

Syntax hints:   → wi 4   ↔ wb 206   = wceq 1541   ∈ wcel 2113   ∖ cdif 3896   class class class wbr 5096  dom cdm 5622   ↾ cres 5624  Fun wfun 6484  (class class class)co 7356   supp csupp 8100  Fincfn 8881   finSupp cfsupp 9262

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1796  ax-4 1810  ax-5 1911  ax-6 1968  ax-7 2009  ax-8 2115  ax-9 2123  ax-10 2146  ax-11 2162  ax-12 2182  ax-ext 2706  ax-sep 5239  ax-nul 5249  ax-pr 5375  ax-un 7678

This theorem depends on definitions:  df-bi 207  df-an 396  df-or 848  df-3or 1087  df-3an 1088  df-tru 1544  df-fal 1554  df-ex 1781  df-nf 1785  df-sb 2068  df-mo 2537  df-eu 2567  df-clab 2713  df-cleq 2726  df-clel 2809  df-nfc 2883  df-ne 2931  df-ral 3050  df-rex 3059  df-reu 3349  df-rab 3398  df-v 3440  df-sbc 3739  df-dif 3902  df-un 3904  df-in 3906  df-ss 3916  df-pss 3919  df-nul 4284  df-if 4478  df-pw 4554  df-sn 4579  df-pr 4581  df-op 4585  df-uni 4862  df-br 5097  df-opab 5159  df-tr 5204  df-id 5517  df-eprel 5522  df-po 5530  df-so 5531  df-fr 5575  df-we 5577  df-xp 5628  df-rel 5629  df-cnv 5630  df-co 5631  df-dm 5632  df-rn 5633  df-res 5634  df-ima 5635  df-ord 6318  df-on 6319  df-lim 6320  df-suc 6321  df-iota 6446  df-fun 6492  df-fn 6493  df-f 6494  df-f1 6495  df-fo 6496  df-f1o 6497  df-fv 6498  df-ov 7359  df-oprab 7360  df-mpo 7361  df-om 7807  df-supp 8101  df-1o 8395  df-en 8882  df-fin 8885  df-fsupp 9263

This theorem is referenced by:  lincext2  48643