Theorem offinsupp1 30461

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 8833	. . 3 ⊢ (𝜑 → (𝐹 supp 𝑌) ∈ Fin)
3		ssidd 3983	. . . 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 7856	. . 3 ⊢ (𝜑 → ((𝐹 ∘f 𝑅𝐺) supp 𝑍) ⊆ (𝐹 supp 𝑌))
10	2, 9	ssfid 8734	. 2 ⊢ (𝜑 → ((𝐹 ∘f 𝑅𝐺) supp 𝑍) ∈ Fin)
11		ovexd 7184	. . . . 5 ⊢ ((𝜑 ∧ (𝑖 ∈ 𝑆 ∧ 𝑗 ∈ 𝑇)) → (𝑖𝑅𝑗) ∈ V)
12		inidm 4188	. . . . 5 ⊢ (𝐴 ∩ 𝐴) = 𝐴
13	11, 5, 6, 7, 7, 12	off 7417	. . . 4 ⊢ (𝜑 → (𝐹 ∘f 𝑅𝐺):𝐴⟶V)
14	13	ffund 6511	. . 3 ⊢ (𝜑 → Fun (𝐹 ∘f 𝑅𝐺))
15		ovexd 7184	. . 3 ⊢ (𝜑 → (𝐹 ∘f 𝑅𝐺) ∈ V)
16		offinsupp1.z	. . 3 ⊢ (𝜑 → 𝑍 ∈ 𝑊)
17		funisfsupp 8831	. . 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 1366	. 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 1536   ∈ wcel 2113  Vcvv 3491   class class class wbr 5059  Fun wfun 6342  ⟶wf 6344  (class class class)co 7149   ∘_f cof 7400   supp csupp 7823  Fincfn 8502   finSupp cfsupp 8826

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1795  ax-4 1809  ax-5 1910  ax-6 1969  ax-7 2014  ax-8 2115  ax-9 2123  ax-10 2144  ax-11 2160  ax-12 2176  ax-ext 2792  ax-rep 5183  ax-sep 5196  ax-nul 5203  ax-pow 5259  ax-pr 5323  ax-un 7454

This theorem depends on definitions:  df-bi 209  df-an 399  df-or 844  df-3or 1083  df-3an 1084  df-tru 1539  df-ex 1780  df-nf 1784  df-sb 2069  df-mo 2621  df-eu 2653  df-clab 2799  df-cleq 2813  df-clel 2892  df-nfc 2962  df-ne 3016  df-ral 3142  df-rex 3143  df-reu 3144  df-rab 3146  df-v 3493  df-sbc 3769  df-csb 3877  df-dif 3932  df-un 3934  df-in 3936  df-ss 3945  df-pss 3947  df-nul 4285  df-if 4461  df-pw 4534  df-sn 4561  df-pr 4563  df-tp 4565  df-op 4567  df-uni 4832  df-iun 4914  df-br 5060  df-opab 5122  df-mpt 5140  df-tr 5166  df-id 5453  df-eprel 5458  df-po 5467  df-so 5468  df-fr 5507  df-we 5509  df-xp 5554  df-rel 5555  df-cnv 5556  df-co 5557  df-dm 5558  df-rn 5559  df-res 5560  df-ima 5561  df-ord 6187  df-on 6188  df-lim 6189  df-suc 6190  df-iota 6307  df-fun 6350  df-fn 6351  df-f 6352  df-f1 6353  df-fo 6354  df-f1o 6355  df-fv 6356  df-ov 7152  df-oprab 7153  df-mpo 7154  df-of 7402  df-om 7574  df-supp 7824  df-er 8282  df-en 8503  df-fin 8506  df-fsupp 8827

This theorem is referenced by:  fedgmullem1  31047