Theorem offinsupp1 30463

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 8840	. . 3 ⊢ (𝜑 → (𝐹 supp 𝑌) ∈ Fin)
3		ssidd 3990	. . . 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 7863	. . 3 ⊢ (𝜑 → ((𝐹 ∘f 𝑅𝐺) supp 𝑍) ⊆ (𝐹 supp 𝑌))
10	2, 9	ssfid 8741	. 2 ⊢ (𝜑 → ((𝐹 ∘f 𝑅𝐺) supp 𝑍) ∈ Fin)
11		ovexd 7191	. . . . 5 ⊢ ((𝜑 ∧ (𝑖 ∈ 𝑆 ∧ 𝑗 ∈ 𝑇)) → (𝑖𝑅𝑗) ∈ V)
12		inidm 4195	. . . . 5 ⊢ (𝐴 ∩ 𝐴) = 𝐴
13	11, 5, 6, 7, 7, 12	off 7424	. . . 4 ⊢ (𝜑 → (𝐹 ∘f 𝑅𝐺):𝐴⟶V)
14	13	ffund 6518	. . 3 ⊢ (𝜑 → Fun (𝐹 ∘f 𝑅𝐺))
15		ovexd 7191	. . 3 ⊢ (𝜑 → (𝐹 ∘f 𝑅𝐺) ∈ V)
16		offinsupp1.z	. . 3 ⊢ (𝜑 → 𝑍 ∈ 𝑊)
17		funisfsupp 8838	. . 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 1367	. 2 ⊢ (𝜑 → ((𝐹 ∘f 𝑅𝐺) finSupp 𝑍 ↔ ((𝐹 ∘f 𝑅𝐺) supp 𝑍) ∈ Fin))
19	10, 18	mpbird 259	1 ⊢ (𝜑 → (𝐹 ∘f 𝑅𝐺) finSupp 𝑍)

Syntax hints:   → wi 4   ↔ wb 208   ∧ wa 398   = wceq 1537   ∈ wcel 2114  Vcvv 3494   class class class wbr 5066  Fun wfun 6349  ⟶wf 6351  (class class class)co 7156   ∘_f cof 7407   supp csupp 7830  Fincfn 8509   finSupp cfsupp 8833

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 1970  ax-7 2015  ax-8 2116  ax-9 2124  ax-10 2145  ax-11 2161  ax-12 2177  ax-ext 2793  ax-rep 5190  ax-sep 5203  ax-nul 5210  ax-pow 5266  ax-pr 5330  ax-un 7461

This theorem depends on definitions:  df-bi 209  df-an 399  df-or 844  df-3or 1084  df-3an 1085  df-tru 1540  df-ex 1781  df-nf 1785  df-sb 2070  df-mo 2622  df-eu 2654  df-clab 2800  df-cleq 2814  df-clel 2893  df-nfc 2963  df-ne 3017  df-ral 3143  df-rex 3144  df-reu 3145  df-rab 3147  df-v 3496  df-sbc 3773  df-csb 3884  df-dif 3939  df-un 3941  df-in 3943  df-ss 3952  df-pss 3954  df-nul 4292  df-if 4468  df-pw 4541  df-sn 4568  df-pr 4570  df-tp 4572  df-op 4574  df-uni 4839  df-iun 4921  df-br 5067  df-opab 5129  df-mpt 5147  df-tr 5173  df-id 5460  df-eprel 5465  df-po 5474  df-so 5475  df-fr 5514  df-we 5516  df-xp 5561  df-rel 5562  df-cnv 5563  df-co 5564  df-dm 5565  df-rn 5566  df-res 5567  df-ima 5568  df-ord 6194  df-on 6195  df-lim 6196  df-suc 6197  df-iota 6314  df-fun 6357  df-fn 6358  df-f 6359  df-f1 6360  df-fo 6361  df-f1o 6362  df-fv 6363  df-ov 7159  df-oprab 7160  df-mpo 7161  df-of 7409  df-om 7581  df-supp 7831  df-er 8289  df-en 8510  df-fin 8513  df-fsupp 8834

This theorem is referenced by:  fedgmullem1  31025