Theorem offinsupp1 31062

Description: Finite support for a function operation. (Contributed by Thierry Arnoux, 8-Jul-2023.)

Hypotheses

Ref	Expression
offinsupp1.a	⊢ (𝜑 → 𝐴 ∈ 𝑉)
offinsupp1.y	⊢ (𝜑 → 𝑌 ∈ 𝑈)
offinsupp1.z	⊢ (𝜑 → 𝑍 ∈ 𝑊)
offinsupp1.f	⊢ (𝜑 → 𝐹:𝐴⟶𝑆)
offinsupp1.g	⊢ (𝜑 → 𝐺:𝐴⟶𝑇)
offinsupp1.1	⊢ (𝜑 → 𝐹 finSupp 𝑌)
offinsupp1.2	⊢ ((𝜑 ∧ 𝑥 ∈ 𝑇) → (𝑌𝑅𝑥) = 𝑍)

Assertion

Ref	Expression
offinsupp1	⊢ (𝜑 → (𝐹 ∘f 𝑅𝐺) finSupp 𝑍)

Distinct variable groups:   𝑥,𝐺   𝑥,𝑅   𝑥,𝑇   𝑥,𝑌   𝑥,𝑍   𝜑,𝑥

Allowed substitution hints:   𝐴(𝑥)   𝑆(𝑥)   𝑈(𝑥)   𝐹(𝑥)   𝑉(𝑥)   𝑊(𝑥)

Proof of Theorem offinsupp1

Dummy variables 𝑖 𝑗 are mutually distinct and distinct from all other variables.

Step	Hyp	Ref	Expression
1		offinsupp1.1	. . . 4 ⊢ (𝜑 → 𝐹 finSupp 𝑌)
2	1	fsuppimpd 9135	. . 3 ⊢ (𝜑 → (𝐹 supp 𝑌) ∈ Fin)
3		ssidd 3944	. . . 4 ⊢ (𝜑 → (𝐹 supp 𝑌) ⊆ (𝐹 supp 𝑌))
4		offinsupp1.2	. . . 4 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝑇) → (𝑌𝑅𝑥) = 𝑍)
5		offinsupp1.f	. . . 4 ⊢ (𝜑 → 𝐹:𝐴⟶𝑆)
6		offinsupp1.g	. . . 4 ⊢ (𝜑 → 𝐺:𝐴⟶𝑇)
7		offinsupp1.a	. . . 4 ⊢ (𝜑 → 𝐴 ∈ 𝑉)
8		offinsupp1.y	. . . 4 ⊢ (𝜑 → 𝑌 ∈ 𝑈)
9	3, 4, 5, 6, 7, 8	suppssof1 8015	. . 3 ⊢ (𝜑 → ((𝐹 ∘f 𝑅𝐺) supp 𝑍) ⊆ (𝐹 supp 𝑌))
10	2, 9	ssfid 9042	. 2 ⊢ (𝜑 → ((𝐹 ∘f 𝑅𝐺) supp 𝑍) ∈ Fin)
11		ovexd 7310	. . . . 5 ⊢ ((𝜑 ∧ (𝑖 ∈ 𝑆 ∧ 𝑗 ∈ 𝑇)) → (𝑖𝑅𝑗) ∈ V)
12		inidm 4152	. . . . 5 ⊢ (𝐴 ∩ 𝐴) = 𝐴
13	11, 5, 6, 7, 7, 12	off 7551	. . . 4 ⊢ (𝜑 → (𝐹 ∘f 𝑅𝐺):𝐴⟶V)
14	13	ffund 6604	. . 3 ⊢ (𝜑 → Fun (𝐹 ∘f 𝑅𝐺))
15		ovexd 7310	. . 3 ⊢ (𝜑 → (𝐹 ∘f 𝑅𝐺) ∈ V)
16		offinsupp1.z	. . 3 ⊢ (𝜑 → 𝑍 ∈ 𝑊)
17		funisfsupp 9133	. . 3 ⊢ ((Fun (𝐹 ∘f 𝑅𝐺) ∧ (𝐹 ∘f 𝑅𝐺) ∈ V ∧ 𝑍 ∈ 𝑊) → ((𝐹 ∘f 𝑅𝐺) finSupp 𝑍 ↔ ((𝐹 ∘f 𝑅𝐺) supp 𝑍) ∈ Fin))
18	14, 15, 16, 17	syl3anc 1370	. 2 ⊢ (𝜑 → ((𝐹 ∘f 𝑅𝐺) finSupp 𝑍 ↔ ((𝐹 ∘f 𝑅𝐺) supp 𝑍) ∈ Fin))
19	10, 18	mpbird 256	1 ⊢ (𝜑 → (𝐹 ∘f 𝑅𝐺) finSupp 𝑍)

Syntax hints:   → wi 4   ↔ wb 205   ∧ wa 396   = wceq 1539   ∈ wcel 2106  Vcvv 3432   class class class wbr 5074  Fun wfun 6427  ⟶wf 6429  (class class class)co 7275   ∘_f cof 7531   supp csupp 7977  Fincfn 8733   finSupp cfsupp 9128

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1798  ax-4 1812  ax-5 1913  ax-6 1971  ax-7 2011  ax-8 2108  ax-9 2116  ax-10 2137  ax-11 2154  ax-12 2171  ax-ext 2709  ax-rep 5209  ax-sep 5223  ax-nul 5230  ax-pr 5352  ax-un 7588

This theorem depends on definitions:  df-bi 206  df-an 397  df-or 845  df-3or 1087  df-3an 1088  df-tru 1542  df-fal 1552  df-ex 1783  df-nf 1787  df-sb 2068  df-mo 2540  df-eu 2569  df-clab 2716  df-cleq 2730  df-clel 2816  df-nfc 2889  df-ne 2944  df-ral 3069  df-rex 3070  df-reu 3072  df-rab 3073  df-v 3434  df-sbc 3717  df-csb 3833  df-dif 3890  df-un 3892  df-in 3894  df-ss 3904  df-pss 3906  df-nul 4257  df-if 4460  df-pw 4535  df-sn 4562  df-pr 4564  df-op 4568  df-uni 4840  df-iun 4926  df-br 5075  df-opab 5137  df-mpt 5158  df-tr 5192  df-id 5489  df-eprel 5495  df-po 5503  df-so 5504  df-fr 5544  df-we 5546  df-xp 5595  df-rel 5596  df-cnv 5597  df-co 5598  df-dm 5599  df-rn 5600  df-res 5601  df-ima 5602  df-ord 6269  df-on 6270  df-lim 6271  df-suc 6272  df-iota 6391  df-fun 6435  df-fn 6436  df-f 6437  df-f1 6438  df-fo 6439  df-f1o 6440  df-fv 6441  df-ov 7278  df-oprab 7279  df-mpo 7280  df-of 7533  df-om 7713  df-supp 7978  df-1o 8297  df-en 8734  df-fin 8737  df-fsupp 9129

This theorem is referenced by:  fedgmullem1  31710