fsuppunbi - Metamath Proof Explorer

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Theorem fsuppunbi 9381

Description: If the union of two classes/functions is a function, this union is finitely supported iff the two functions are finitely supported. (Contributed by AV, 18-Jun-2019.)

**Hypothesis**
Ref	Expression
fsuppunbi.u	⊢ (𝜑 → Fun (𝐹 ∪ 𝐺))

**Assertion**
Ref	Expression
fsuppunbi	⊢ (𝜑 → ((𝐹 ∪ 𝐺) finSupp 𝑍 ↔ (𝐹 finSupp 𝑍 ∧ 𝐺 finSupp 𝑍)))

**Proof of Theorem fsuppunbi**
Step	Hyp	Ref	Expression
1		relfsupp 9355	. . . . 5 ⊢ Rel finSupp
2	1	brrelex12i 5706	. . . 4 ⊢ ((𝐹 ∪ 𝐺) finSupp 𝑍 → ((𝐹 ∪ 𝐺) ∈ V ∧ 𝑍 ∈ V))
3		unexb 7763	. . . . 5 ⊢ ((𝐹 ∈ V ∧ 𝐺 ∈ V) ↔ (𝐹 ∪ 𝐺) ∈ V)
4		simpr 490	. . . . . . . . . . . 12 ⊢ ((Fun (𝐹 ∪ 𝐺) ∧ ((𝐹 ∪ 𝐺) supp 𝑍) ∈ Fin) → ((𝐹 ∪ 𝐺) supp 𝑍) ∈ Fin)
5	4	adantr 486	. . . . . . . . . . 11 ⊢ (((Fun (𝐹 ∪ 𝐺) ∧ ((𝐹 ∪ 𝐺) supp 𝑍) ∈ Fin) ∧ ((𝐹 ∈ V ∧ 𝐺 ∈ V) ∧ 𝑍 ∈ V)) → ((𝐹 ∪ 𝐺) supp 𝑍) ∈ Fin)
6		simprlr 792	. . . . . . . . . . . 12 ⊢ (((Fun (𝐹 ∪ 𝐺) ∧ ((𝐹 ∪ 𝐺) supp 𝑍) ∈ Fin) ∧ ((𝐹 ∈ V ∧ 𝐺 ∈ V) ∧ 𝑍 ∈ V)) → 𝐺 ∈ V)
7	6	suppun 8201	. . . . . . . . . . 11 ⊢ (((Fun (𝐹 ∪ 𝐺) ∧ ((𝐹 ∪ 𝐺) supp 𝑍) ∈ Fin) ∧ ((𝐹 ∈ V ∧ 𝐺 ∈ V) ∧ 𝑍 ∈ V)) → (𝐹 supp 𝑍) ⊆ ((𝐹 ∪ 𝐺) supp 𝑍))
8	5, 7	ssfid 9260	. . . . . . . . . 10 ⊢ (((Fun (𝐹 ∪ 𝐺) ∧ ((𝐹 ∪ 𝐺) supp 𝑍) ∈ Fin) ∧ ((𝐹 ∈ V ∧ 𝐺 ∈ V) ∧ 𝑍 ∈ V)) → (𝐹 supp 𝑍) ∈ Fin)
9		fununfun 6588	. . . . . . . . . . . . . 14 ⊢ (Fun (𝐹 ∪ 𝐺) → (Fun 𝐹 ∧ Fun 𝐺))
10	9	simpld 500	. . . . . . . . . . . . 13 ⊢ (Fun (𝐹 ∪ 𝐺) → Fun 𝐹)
11	10	adantr 486	. . . . . . . . . . . 12 ⊢ ((Fun (𝐹 ∪ 𝐺) ∧ ((𝐹 ∪ 𝐺) supp 𝑍) ∈ Fin) → Fun 𝐹)
12	11	adantr 486	. . . . . . . . . . 11 ⊢ (((Fun (𝐹 ∪ 𝐺) ∧ ((𝐹 ∪ 𝐺) supp 𝑍) ∈ Fin) ∧ ((𝐹 ∈ V ∧ 𝐺 ∈ V) ∧ 𝑍 ∈ V)) → Fun 𝐹)
13		simprll 791	. . . . . . . . . . 11 ⊢ (((Fun (𝐹 ∪ 𝐺) ∧ ((𝐹 ∪ 𝐺) supp 𝑍) ∈ Fin) ∧ ((𝐹 ∈ V ∧ 𝐺 ∈ V) ∧ 𝑍 ∈ V)) → 𝐹 ∈ V)
14		simpr 490	. . . . . . . . . . . 12 ⊢ (((𝐹 ∈ V ∧ 𝐺 ∈ V) ∧ 𝑍 ∈ V) → 𝑍 ∈ V)
15	14	adantl 487	. . . . . . . . . . 11 ⊢ (((Fun (𝐹 ∪ 𝐺) ∧ ((𝐹 ∪ 𝐺) supp 𝑍) ∈ Fin) ∧ ((𝐹 ∈ V ∧ 𝐺 ∈ V) ∧ 𝑍 ∈ V)) → 𝑍 ∈ V)
16		funisfsupp 9359	. . . . . . . . . . 11 ⊢ ((Fun 𝐹 ∧ 𝐹 ∈ V ∧ 𝑍 ∈ V) → (𝐹 finSupp 𝑍 ↔ (𝐹 supp 𝑍) ∈ Fin))
17	12, 13, 15, 16	syl3anc 1398	. . . . . . . . . 10 ⊢ (((Fun (𝐹 ∪ 𝐺) ∧ ((𝐹 ∪ 𝐺) supp 𝑍) ∈ Fin) ∧ ((𝐹 ∈ V ∧ 𝐺 ∈ V) ∧ 𝑍 ∈ V)) → (𝐹 finSupp 𝑍 ↔ (𝐹 supp 𝑍) ∈ Fin))
18	8, 17	mpbird 260	. . . . . . . . 9 ⊢ (((Fun (𝐹 ∪ 𝐺) ∧ ((𝐹 ∪ 𝐺) supp 𝑍) ∈ Fin) ∧ ((𝐹 ∈ V ∧ 𝐺 ∈ V) ∧ 𝑍 ∈ V)) → 𝐹 finSupp 𝑍)
19		uncom 4105	. . . . . . . . . . . . . . 15 ⊢ (𝐹 ∪ 𝐺) = (𝐺 ∪ 𝐹)
20	19	oveq1i 7430	. . . . . . . . . . . . . 14 ⊢ ((𝐹 ∪ 𝐺) supp 𝑍) = ((𝐺 ∪ 𝐹) supp 𝑍)
21	20	eleq1i 2852	. . . . . . . . . . . . 13 ⊢ (((𝐹 ∪ 𝐺) supp 𝑍) ∈ Fin ↔ ((𝐺 ∪ 𝐹) supp 𝑍) ∈ Fin)
22	21	bilani 510	. . . . . . . . . . . 12 ⊢ ((Fun (𝐹 ∪ 𝐺) ∧ ((𝐹 ∪ 𝐺) supp 𝑍) ∈ Fin) → ((𝐺 ∪ 𝐹) supp 𝑍) ∈ Fin)
23	22	adantr 486	. . . . . . . . . . 11 ⊢ (((Fun (𝐹 ∪ 𝐺) ∧ ((𝐹 ∪ 𝐺) supp 𝑍) ∈ Fin) ∧ ((𝐹 ∈ V ∧ 𝐺 ∈ V) ∧ 𝑍 ∈ V)) → ((𝐺 ∪ 𝐹) supp 𝑍) ∈ Fin)
24	13	suppun 8201	. . . . . . . . . . 11 ⊢ (((Fun (𝐹 ∪ 𝐺) ∧ ((𝐹 ∪ 𝐺) supp 𝑍) ∈ Fin) ∧ ((𝐹 ∈ V ∧ 𝐺 ∈ V) ∧ 𝑍 ∈ V)) → (𝐺 supp 𝑍) ⊆ ((𝐺 ∪ 𝐹) supp 𝑍))
25	23, 24	ssfid 9260	. . . . . . . . . 10 ⊢ (((Fun (𝐹 ∪ 𝐺) ∧ ((𝐹 ∪ 𝐺) supp 𝑍) ∈ Fin) ∧ ((𝐹 ∈ V ∧ 𝐺 ∈ V) ∧ 𝑍 ∈ V)) → (𝐺 supp 𝑍) ∈ Fin)
26	9	simprd 501	. . . . . . . . . . . . 13 ⊢ (Fun (𝐹 ∪ 𝐺) → Fun 𝐺)
27	26	adantr 486	. . . . . . . . . . . 12 ⊢ ((Fun (𝐹 ∪ 𝐺) ∧ ((𝐹 ∪ 𝐺) supp 𝑍) ∈ Fin) → Fun 𝐺)
28	27	adantr 486	. . . . . . . . . . 11 ⊢ (((Fun (𝐹 ∪ 𝐺) ∧ ((𝐹 ∪ 𝐺) supp 𝑍) ∈ Fin) ∧ ((𝐹 ∈ V ∧ 𝐺 ∈ V) ∧ 𝑍 ∈ V)) → Fun 𝐺)
29		funisfsupp 9359	. . . . . . . . . . 11 ⊢ ((Fun 𝐺 ∧ 𝐺 ∈ V ∧ 𝑍 ∈ V) → (𝐺 finSupp 𝑍 ↔ (𝐺 supp 𝑍) ∈ Fin))
30	28, 6, 15, 29	syl3anc 1398	. . . . . . . . . 10 ⊢ (((Fun (𝐹 ∪ 𝐺) ∧ ((𝐹 ∪ 𝐺) supp 𝑍) ∈ Fin) ∧ ((𝐹 ∈ V ∧ 𝐺 ∈ V) ∧ 𝑍 ∈ V)) → (𝐺 finSupp 𝑍 ↔ (𝐺 supp 𝑍) ∈ Fin))
31	25, 30	mpbird 260	. . . . . . . . 9 ⊢ (((Fun (𝐹 ∪ 𝐺) ∧ ((𝐹 ∪ 𝐺) supp 𝑍) ∈ Fin) ∧ ((𝐹 ∈ V ∧ 𝐺 ∈ V) ∧ 𝑍 ∈ V)) → 𝐺 finSupp 𝑍)
32	18, 31	jca 521	. . . . . . . 8 ⊢ (((Fun (𝐹 ∪ 𝐺) ∧ ((𝐹 ∪ 𝐺) supp 𝑍) ∈ Fin) ∧ ((𝐹 ∈ V ∧ 𝐺 ∈ V) ∧ 𝑍 ∈ V)) → (𝐹 finSupp 𝑍 ∧ 𝐺 finSupp 𝑍))
33	32	a1d 26	. . . . . . 7 ⊢ (((Fun (𝐹 ∪ 𝐺) ∧ ((𝐹 ∪ 𝐺) supp 𝑍) ∈ Fin) ∧ ((𝐹 ∈ V ∧ 𝐺 ∈ V) ∧ 𝑍 ∈ V)) → (𝜑 → (𝐹 finSupp 𝑍 ∧ 𝐺 finSupp 𝑍)))
34	33	ex 418	. . . . . 6 ⊢ ((Fun (𝐹 ∪ 𝐺) ∧ ((𝐹 ∪ 𝐺) supp 𝑍) ∈ Fin) → (((𝐹 ∈ V ∧ 𝐺 ∈ V) ∧ 𝑍 ∈ V) → (𝜑 → (𝐹 finSupp 𝑍 ∧ 𝐺 finSupp 𝑍))))
35		fsuppimp 9360	. . . . . 6 ⊢ ((𝐹 ∪ 𝐺) finSupp 𝑍 → (Fun (𝐹 ∪ 𝐺) ∧ ((𝐹 ∪ 𝐺) supp 𝑍) ∈ Fin))
36	34, 35	syl11 34	. . . . 5 ⊢ (((𝐹 ∈ V ∧ 𝐺 ∈ V) ∧ 𝑍 ∈ V) → ((𝐹 ∪ 𝐺) finSupp 𝑍 → (𝜑 → (𝐹 finSupp 𝑍 ∧ 𝐺 finSupp 𝑍))))
37	3, 36	sylanbr 594	. . . 4 ⊢ (((𝐹 ∪ 𝐺) ∈ V ∧ 𝑍 ∈ V) → ((𝐹 ∪ 𝐺) finSupp 𝑍 → (𝜑 → (𝐹 finSupp 𝑍 ∧ 𝐺 finSupp 𝑍))))
38	2, 37	mpcom 39	. . 3 ⊢ ((𝐹 ∪ 𝐺) finSupp 𝑍 → (𝜑 → (𝐹 finSupp 𝑍 ∧ 𝐺 finSupp 𝑍)))
39	38	com12 33	. 2 ⊢ (𝜑 → ((𝐹 ∪ 𝐺) finSupp 𝑍 → (𝐹 finSupp 𝑍 ∧ 𝐺 finSupp 𝑍)))
40		simpl 488	. . . . . 6 ⊢ ((𝐹 finSupp 𝑍 ∧ 𝐺 finSupp 𝑍) → 𝐹 finSupp 𝑍)
41		simpr 490	. . . . . 6 ⊢ ((𝐹 finSupp 𝑍 ∧ 𝐺 finSupp 𝑍) → 𝐺 finSupp 𝑍)
42	40, 41	fsuppun 9379	. . . . 5 ⊢ ((𝐹 finSupp 𝑍 ∧ 𝐺 finSupp 𝑍) → ((𝐹 ∪ 𝐺) supp 𝑍) ∈ Fin)
43	42	adantl 487	. . . 4 ⊢ ((𝜑 ∧ (𝐹 finSupp 𝑍 ∧ 𝐺 finSupp 𝑍)) → ((𝐹 ∪ 𝐺) supp 𝑍) ∈ Fin)
44		fsuppunbi.u	. . . . . 6 ⊢ (𝜑 → Fun (𝐹 ∪ 𝐺))
45	44	adantr 486	. . . . 5 ⊢ ((𝜑 ∧ (𝐹 finSupp 𝑍 ∧ 𝐺 finSupp 𝑍)) → Fun (𝐹 ∪ 𝐺))
46	1	brrelex1i 5707	. . . . . . 7 ⊢ (𝐹 finSupp 𝑍 → 𝐹 ∈ V)
47	1	brrelex1i 5707	. . . . . . 7 ⊢ (𝐺 finSupp 𝑍 → 𝐺 ∈ V)
48		unexg 7760	. . . . . . 7 ⊢ ((𝐹 ∈ V ∧ 𝐺 ∈ V) → (𝐹 ∪ 𝐺) ∈ V)
49	46, 47, 48	syl2an 608	. . . . . 6 ⊢ ((𝐹 finSupp 𝑍 ∧ 𝐺 finSupp 𝑍) → (𝐹 ∪ 𝐺) ∈ V)
50	49	adantl 487	. . . . 5 ⊢ ((𝜑 ∧ (𝐹 finSupp 𝑍 ∧ 𝐺 finSupp 𝑍)) → (𝐹 ∪ 𝐺) ∈ V)
51	1	brrelex2i 5708	. . . . . . 7 ⊢ (𝐹 finSupp 𝑍 → 𝑍 ∈ V)
52	51	adantr 486	. . . . . 6 ⊢ ((𝐹 finSupp 𝑍 ∧ 𝐺 finSupp 𝑍) → 𝑍 ∈ V)
53	52	adantl 487	. . . . 5 ⊢ ((𝜑 ∧ (𝐹 finSupp 𝑍 ∧ 𝐺 finSupp 𝑍)) → 𝑍 ∈ V)
54		funisfsupp 9359	. . . . 5 ⊢ ((Fun (𝐹 ∪ 𝐺) ∧ (𝐹 ∪ 𝐺) ∈ V ∧ 𝑍 ∈ V) → ((𝐹 ∪ 𝐺) finSupp 𝑍 ↔ ((𝐹 ∪ 𝐺) supp 𝑍) ∈ Fin))
55	45, 50, 53, 54	syl3anc 1398	. . . 4 ⊢ ((𝜑 ∧ (𝐹 finSupp 𝑍 ∧ 𝐺 finSupp 𝑍)) → ((𝐹 ∪ 𝐺) finSupp 𝑍 ↔ ((𝐹 ∪ 𝐺) supp 𝑍) ∈ Fin))
56	43, 55	mpbird 260	. . 3 ⊢ ((𝜑 ∧ (𝐹 finSupp 𝑍 ∧ 𝐺 finSupp 𝑍)) → (𝐹 ∪ 𝐺) finSupp 𝑍)
57	56	ex 418	. 2 ⊢ (𝜑 → ((𝐹 finSupp 𝑍 ∧ 𝐺 finSupp 𝑍) → (𝐹 ∪ 𝐺) finSupp 𝑍))
58	39, 57	impbid 215	1 ⊢ (𝜑 → ((𝐹 ∪ 𝐺) finSupp 𝑍 ↔ (𝐹 finSupp 𝑍 ∧ 𝐺 finSupp 𝑍)))

Colors of variables: wff setvar class

This proof depends on syntax axioms: → wi 4 ↔ wb 209 ∧ wa 401 ∈ wcel 2145 Vcvv 3451 ∪ cun 3897 class class class wbr 5103 Fun wfun 6532 (class class class)co 7420 supp csupp 8177 Fincfn 8973 finSupp cfsupp 9353

This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1828 ax-4 1842 ax-5 1943 ax-6 2000 ax-7 2041 ax-8 2147 ax-9 2155 ax-10 2178 ax-11 2194 ax-12 2213 ax-ext 2733 ax-sep 5249 ax-nul 5260 ax-pr 5391 ax-un 7751

This proof depends on definitions: df-bi 210 df-an 402 df-or 862 df-3or 1104 df-3an 1105 df-tru 1573 df-fal 1583 df-ex 1813 df-nf 1817 df-sb 2100 df-mo 2565 df-eu 2595 df-clab 2740 df-cleq 2753 df-clel 2836 df-nfc 2910 df-ne 2957 df-ral 3078 df-rex 3088 df-reu 3367 df-rab 3414 df-v 3453 df-sbc 3740 df-dif 3902 df-un 3904 df-in 3906 df-ss 3916 df-pss 3919 df-nul 4280 df-if 4483 df-pw 4559 df-sn 4585 df-pr 4587 df-op 4591 df-uni 4868 df-br 5104 df-opab 5168 df-tr 5213 df-id 5546 df-eprel 5551 df-po 5559 df-so 5560 df-fr 5604 df-we 5606 df-xp 5657 df-rel 5658 df-cnv 5659 df-co 5660 df-dm 5661 df-rn 5662 df-res 5663 df-ima 5664 df-ord 6365 df-on 6366 df-lim 6367 df-suc 6368 df-iota 6494 df-fun 6540 df-fn 6541 df-f 6542 df-f1 6543 df-fo 6544 df-f1o 6545 df-fv 6546 df-ov 7423 df-oprab 7424 df-mpo 7425 df-om 7878 df-supp 8178 df-1o 8476 df-en 8974 df-fin 8977 df-fsupp 9354

This theorem is used by: funsnfsupp 9384 lbsdiflsp0 34258

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