Theorem mptiffisupp 32513

Description: Conditions for a mapping function defined with a conditional to have finite support. (Contributed by Thierry Arnoux, 20-Feb-2025.)

Hypotheses

Ref	Expression
mptiffisupp.f	⊢ 𝐹 = (𝑥 ∈ 𝐴 ↦ if(𝑥 ∈ 𝐵, 𝐶, 𝑍))
mptiffisupp.a	⊢ (𝜑 → 𝐴 ∈ 𝑈)
mptiffisupp.b	⊢ (𝜑 → 𝐵 ∈ Fin)
mptiffisupp.c	⊢ ((𝜑 ∧ 𝑥 ∈ 𝐵) → 𝐶 ∈ 𝑉)
mptiffisupp.z	⊢ (𝜑 → 𝑍 ∈ 𝑊)

Assertion

Ref	Expression
mptiffisupp	⊢ (𝜑 → 𝐹 finSupp 𝑍)

Distinct variable groups:   𝑥,𝐴   𝑥,𝐵   𝑥,𝑉   𝑥,𝑍   𝜑,𝑥

Allowed substitution hints:   𝐶(𝑥)   𝑈(𝑥)   𝐹(𝑥)   𝑊(𝑥)

Proof of Theorem mptiffisupp

Step	Hyp	Ref	Expression
1		mptiffisupp.f	. . 3 ⊢ 𝐹 = (𝑥 ∈ 𝐴 ↦ if(𝑥 ∈ 𝐵, 𝐶, 𝑍))
2		mptiffisupp.a	. . . 4 ⊢ (𝜑 → 𝐴 ∈ 𝑈)
3	2	mptexd 7230	. . 3 ⊢ (𝜑 → (𝑥 ∈ 𝐴 ↦ if(𝑥 ∈ 𝐵, 𝐶, 𝑍)) ∈ V)
4	1, 3	eqeltrid 2829	. 2 ⊢ (𝜑 → 𝐹 ∈ V)
5		mptiffisupp.z	. 2 ⊢ (𝜑 → 𝑍 ∈ 𝑊)
6	1	funmpt2 6587	. . 3 ⊢ Fun 𝐹
7	6	a1i 11	. 2 ⊢ (𝜑 → Fun 𝐹)
8		partfun 6697	. . . . 5 ⊢ (𝑥 ∈ 𝐴 ↦ if(𝑥 ∈ 𝐵, 𝐶, 𝑍)) = ((𝑥 ∈ (𝐴 ∩ 𝐵) ↦ 𝐶) ∪ (𝑥 ∈ (𝐴 ∖ 𝐵) ↦ 𝑍))
9	1, 8	eqtri 2753	. . . 4 ⊢ 𝐹 = ((𝑥 ∈ (𝐴 ∩ 𝐵) ↦ 𝐶) ∪ (𝑥 ∈ (𝐴 ∖ 𝐵) ↦ 𝑍))
10	9	oveq1i 7423	. . 3 ⊢ (𝐹 supp 𝑍) = (((𝑥 ∈ (𝐴 ∩ 𝐵) ↦ 𝐶) ∪ (𝑥 ∈ (𝐴 ∖ 𝐵) ↦ 𝑍)) supp 𝑍)
11		inss2 4225	. . . . . . . . 9 ⊢ (𝐴 ∩ 𝐵) ⊆ 𝐵
12	11	a1i 11	. . . . . . . 8 ⊢ (𝜑 → (𝐴 ∩ 𝐵) ⊆ 𝐵)
13	12	sselda 3973	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑥 ∈ (𝐴 ∩ 𝐵)) → 𝑥 ∈ 𝐵)
14		mptiffisupp.c	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐵) → 𝐶 ∈ 𝑉)
15	13, 14	syldan 589	. . . . . 6 ⊢ ((𝜑 ∧ 𝑥 ∈ (𝐴 ∩ 𝐵)) → 𝐶 ∈ 𝑉)
16	15	fmpttd 7118	. . . . 5 ⊢ (𝜑 → (𝑥 ∈ (𝐴 ∩ 𝐵) ↦ 𝐶):(𝐴 ∩ 𝐵)⟶𝑉)
17		incom 4196	. . . . . 6 ⊢ (𝐵 ∩ 𝐴) = (𝐴 ∩ 𝐵)
18		mptiffisupp.b	. . . . . . 7 ⊢ (𝜑 → 𝐵 ∈ Fin)
19		infi 9286	. . . . . . 7 ⊢ (𝐵 ∈ Fin → (𝐵 ∩ 𝐴) ∈ Fin)
20	18, 19	syl 17	. . . . . 6 ⊢ (𝜑 → (𝐵 ∩ 𝐴) ∈ Fin)
21	17, 20	eqeltrrid 2830	. . . . 5 ⊢ (𝜑 → (𝐴 ∩ 𝐵) ∈ Fin)
22	16, 21, 5	fidmfisupp 9391	. . . 4 ⊢ (𝜑 → (𝑥 ∈ (𝐴 ∩ 𝐵) ↦ 𝐶) finSupp 𝑍)
23		difexg 5325	. . . . . 6 ⊢ (𝐴 ∈ 𝑈 → (𝐴 ∖ 𝐵) ∈ V)
24		mptexg 7227	. . . . . 6 ⊢ ((𝐴 ∖ 𝐵) ∈ V → (𝑥 ∈ (𝐴 ∖ 𝐵) ↦ 𝑍) ∈ V)
25	2, 23, 24	3syl 18	. . . . 5 ⊢ (𝜑 → (𝑥 ∈ (𝐴 ∖ 𝐵) ↦ 𝑍) ∈ V)
26		funmpt 6586	. . . . . 6 ⊢ Fun (𝑥 ∈ (𝐴 ∖ 𝐵) ↦ 𝑍)
27	26	a1i 11	. . . . 5 ⊢ (𝜑 → Fun (𝑥 ∈ (𝐴 ∖ 𝐵) ↦ 𝑍))
28		supppreima 32511	. . . . . . . 8 ⊢ ((Fun (𝑥 ∈ (𝐴 ∖ 𝐵) ↦ 𝑍) ∧ (𝑥 ∈ (𝐴 ∖ 𝐵) ↦ 𝑍) ∈ V ∧ 𝑍 ∈ 𝑊) → ((𝑥 ∈ (𝐴 ∖ 𝐵) ↦ 𝑍) supp 𝑍) = (◡(𝑥 ∈ (𝐴 ∖ 𝐵) ↦ 𝑍) “ (ran (𝑥 ∈ (𝐴 ∖ 𝐵) ↦ 𝑍) ∖ {𝑍})))
29	26, 25, 5, 28	mp3an2i 1462	. . . . . . 7 ⊢ (𝜑 → ((𝑥 ∈ (𝐴 ∖ 𝐵) ↦ 𝑍) supp 𝑍) = (◡(𝑥 ∈ (𝐴 ∖ 𝐵) ↦ 𝑍) “ (ran (𝑥 ∈ (𝐴 ∖ 𝐵) ↦ 𝑍) ∖ {𝑍})))
30		simpr 483	. . . . . . . . . . . . . 14 ⊢ ((𝜑 ∧ (𝐴 ∖ 𝐵) = ∅) → (𝐴 ∖ 𝐵) = ∅)
31	30	mpteq1d 5239	. . . . . . . . . . . . 13 ⊢ ((𝜑 ∧ (𝐴 ∖ 𝐵) = ∅) → (𝑥 ∈ (𝐴 ∖ 𝐵) ↦ 𝑍) = (𝑥 ∈ ∅ ↦ 𝑍))
32		mpt0 6692	. . . . . . . . . . . . 13 ⊢ (𝑥 ∈ ∅ ↦ 𝑍) = ∅
33	31, 32	eqtrdi 2781	. . . . . . . . . . . 12 ⊢ ((𝜑 ∧ (𝐴 ∖ 𝐵) = ∅) → (𝑥 ∈ (𝐴 ∖ 𝐵) ↦ 𝑍) = ∅)
34	33	cnveqd 5873	. . . . . . . . . . 11 ⊢ ((𝜑 ∧ (𝐴 ∖ 𝐵) = ∅) → ◡(𝑥 ∈ (𝐴 ∖ 𝐵) ↦ 𝑍) = ◡∅)
35		cnv0 6141	. . . . . . . . . . 11 ⊢ ◡∅ = ∅
36	34, 35	eqtrdi 2781	. . . . . . . . . 10 ⊢ ((𝜑 ∧ (𝐴 ∖ 𝐵) = ∅) → ◡(𝑥 ∈ (𝐴 ∖ 𝐵) ↦ 𝑍) = ∅)
37	36	imaeq1d 6058	. . . . . . . . 9 ⊢ ((𝜑 ∧ (𝐴 ∖ 𝐵) = ∅) → (◡(𝑥 ∈ (𝐴 ∖ 𝐵) ↦ 𝑍) “ (ran (𝑥 ∈ (𝐴 ∖ 𝐵) ↦ 𝑍) ∖ {𝑍})) = (∅ “ (ran (𝑥 ∈ (𝐴 ∖ 𝐵) ↦ 𝑍) ∖ {𝑍})))
38		0ima 6077	. . . . . . . . 9 ⊢ (∅ “ (ran (𝑥 ∈ (𝐴 ∖ 𝐵) ↦ 𝑍) ∖ {𝑍})) = ∅
39	37, 38	eqtrdi 2781	. . . . . . . 8 ⊢ ((𝜑 ∧ (𝐴 ∖ 𝐵) = ∅) → (◡(𝑥 ∈ (𝐴 ∖ 𝐵) ↦ 𝑍) “ (ran (𝑥 ∈ (𝐴 ∖ 𝐵) ↦ 𝑍) ∖ {𝑍})) = ∅)
40		eqid 2725	. . . . . . . . . . . . 13 ⊢ (𝑥 ∈ (𝐴 ∖ 𝐵) ↦ 𝑍) = (𝑥 ∈ (𝐴 ∖ 𝐵) ↦ 𝑍)
41		simpr 483	. . . . . . . . . . . . 13 ⊢ ((𝜑 ∧ (𝐴 ∖ 𝐵) ≠ ∅) → (𝐴 ∖ 𝐵) ≠ ∅)
42	40, 41	rnmptc 7213	. . . . . . . . . . . 12 ⊢ ((𝜑 ∧ (𝐴 ∖ 𝐵) ≠ ∅) → ran (𝑥 ∈ (𝐴 ∖ 𝐵) ↦ 𝑍) = {𝑍})
43	42	difeq1d 4114	. . . . . . . . . . 11 ⊢ ((𝜑 ∧ (𝐴 ∖ 𝐵) ≠ ∅) → (ran (𝑥 ∈ (𝐴 ∖ 𝐵) ↦ 𝑍) ∖ {𝑍}) = ({𝑍} ∖ {𝑍}))
44		difid 4367	. . . . . . . . . . 11 ⊢ ({𝑍} ∖ {𝑍}) = ∅
45	43, 44	eqtrdi 2781	. . . . . . . . . 10 ⊢ ((𝜑 ∧ (𝐴 ∖ 𝐵) ≠ ∅) → (ran (𝑥 ∈ (𝐴 ∖ 𝐵) ↦ 𝑍) ∖ {𝑍}) = ∅)
46	45	imaeq2d 6059	. . . . . . . . 9 ⊢ ((𝜑 ∧ (𝐴 ∖ 𝐵) ≠ ∅) → (◡(𝑥 ∈ (𝐴 ∖ 𝐵) ↦ 𝑍) “ (ran (𝑥 ∈ (𝐴 ∖ 𝐵) ↦ 𝑍) ∖ {𝑍})) = (◡(𝑥 ∈ (𝐴 ∖ 𝐵) ↦ 𝑍) “ ∅))
47		ima0 6076	. . . . . . . . 9 ⊢ (◡(𝑥 ∈ (𝐴 ∖ 𝐵) ↦ 𝑍) “ ∅) = ∅
48	46, 47	eqtrdi 2781	. . . . . . . 8 ⊢ ((𝜑 ∧ (𝐴 ∖ 𝐵) ≠ ∅) → (◡(𝑥 ∈ (𝐴 ∖ 𝐵) ↦ 𝑍) “ (ran (𝑥 ∈ (𝐴 ∖ 𝐵) ↦ 𝑍) ∖ {𝑍})) = ∅)
49	39, 48	pm2.61dane 3019	. . . . . . 7 ⊢ (𝜑 → (◡(𝑥 ∈ (𝐴 ∖ 𝐵) ↦ 𝑍) “ (ran (𝑥 ∈ (𝐴 ∖ 𝐵) ↦ 𝑍) ∖ {𝑍})) = ∅)
50	29, 49	eqtrd 2765	. . . . . 6 ⊢ (𝜑 → ((𝑥 ∈ (𝐴 ∖ 𝐵) ↦ 𝑍) supp 𝑍) = ∅)
51		0fin 9189	. . . . . 6 ⊢ ∅ ∈ Fin
52	50, 51	eqeltrdi 2833	. . . . 5 ⊢ (𝜑 → ((𝑥 ∈ (𝐴 ∖ 𝐵) ↦ 𝑍) supp 𝑍) ∈ Fin)
53	25, 5, 27, 52	isfsuppd 9385	. . . 4 ⊢ (𝜑 → (𝑥 ∈ (𝐴 ∖ 𝐵) ↦ 𝑍) finSupp 𝑍)
54	22, 53	fsuppun 9405	. . 3 ⊢ (𝜑 → (((𝑥 ∈ (𝐴 ∩ 𝐵) ↦ 𝐶) ∪ (𝑥 ∈ (𝐴 ∖ 𝐵) ↦ 𝑍)) supp 𝑍) ∈ Fin)
55	10, 54	eqeltrid 2829	. 2 ⊢ (𝜑 → (𝐹 supp 𝑍) ∈ Fin)
56	4, 5, 7, 55	isfsuppd 9385	1 ⊢ (𝜑 → 𝐹 finSupp 𝑍)

Syntax hints:   → wi 4   ∧ wa 394   = wceq 1533   ∈ wcel 2098   ≠ wne 2930  Vcvv 3463   ∖ cdif 3938   ∪ cun 3939   ∩ cin 3940   ⊆ wss 3941  ∅c0 4319  ifcif 4525  {csn 4625   class class class wbr 5144   ↦ cmpt 5227  ^◡ccnv 5672  ran crn 5674   “ cima 5676  Fun wfun 6537  (class class class)co 7413   supp csupp 8158  Fincfn 8957   finSupp cfsupp 9380

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1789  ax-4 1803  ax-5 1905  ax-6 1963  ax-7 2003  ax-8 2100  ax-9 2108  ax-10 2129  ax-11 2146  ax-12 2166  ax-ext 2696  ax-rep 5281  ax-sep 5295  ax-nul 5302  ax-pr 5424  ax-un 7735

This theorem depends on definitions:  df-bi 206  df-an 395  df-or 846  df-3or 1085  df-3an 1086  df-tru 1536  df-fal 1546  df-ex 1774  df-nf 1778  df-sb 2060  df-mo 2528  df-eu 2557  df-clab 2703  df-cleq 2717  df-clel 2802  df-nfc 2877  df-ne 2931  df-ral 3052  df-rex 3061  df-reu 3365  df-rab 3420  df-v 3465  df-sbc 3771  df-csb 3887  df-dif 3944  df-un 3946  df-in 3948  df-ss 3958  df-pss 3961  df-nul 4320  df-if 4526  df-pw 4601  df-sn 4626  df-pr 4628  df-op 4632  df-uni 4905  df-iun 4994  df-br 5145  df-opab 5207  df-mpt 5228  df-tr 5262  df-id 5571  df-eprel 5577  df-po 5585  df-so 5586  df-fr 5628  df-we 5630  df-xp 5679  df-rel 5680  df-cnv 5681  df-co 5682  df-dm 5683  df-rn 5684  df-res 5685  df-ima 5686  df-ord 6368  df-on 6369  df-lim 6370  df-suc 6371  df-iota 6495  df-fun 6545  df-fn 6546  df-f 6547  df-f1 6548  df-fo 6549  df-f1o 6550  df-fv 6551  df-ov 7416  df-oprab 7417  df-mpo 7418  df-om 7866  df-supp 8159  df-1o 8480  df-en 8958  df-fin 8961  df-fsupp 9381

This theorem is referenced by:  elrspunsn  33190  gsummoncoe1fzo  33321