Theorem suppeqfsuppbi 9269

Description: If two functions have the same support, one function is finitely supported iff the other one is finitely supported. (Contributed by AV, 30-Jun-2019.)

Assertion

Ref	Expression
suppeqfsuppbi	⊢ (((𝐹 ∈ 𝑈 ∧ Fun 𝐹) ∧ (𝐺 ∈ 𝑉 ∧ Fun 𝐺)) → ((𝐹 supp 𝑍) = (𝐺 supp 𝑍) → (𝐹 finSupp 𝑍 ↔ 𝐺 finSupp 𝑍)))

Proof of Theorem suppeqfsuppbi

Step	Hyp	Ref	Expression
1		simprlr 779	. . . . . 6 ⊢ ((𝑍 ∈ V ∧ ((𝐹 ∈ 𝑈 ∧ Fun 𝐹) ∧ (𝐺 ∈ 𝑉 ∧ Fun 𝐺))) → Fun 𝐹)
2		simprll 778	. . . . . 6 ⊢ ((𝑍 ∈ V ∧ ((𝐹 ∈ 𝑈 ∧ Fun 𝐹) ∧ (𝐺 ∈ 𝑉 ∧ Fun 𝐺))) → 𝐹 ∈ 𝑈)
3		simpl 482	. . . . . 6 ⊢ ((𝑍 ∈ V ∧ ((𝐹 ∈ 𝑈 ∧ Fun 𝐹) ∧ (𝐺 ∈ 𝑉 ∧ Fun 𝐺))) → 𝑍 ∈ V)
4		funisfsupp 9257	. . . . . 6 ⊢ ((Fun 𝐹 ∧ 𝐹 ∈ 𝑈 ∧ 𝑍 ∈ V) → (𝐹 finSupp 𝑍 ↔ (𝐹 supp 𝑍) ∈ Fin))
5	1, 2, 3, 4	syl3anc 1373	. . . . 5 ⊢ ((𝑍 ∈ V ∧ ((𝐹 ∈ 𝑈 ∧ Fun 𝐹) ∧ (𝐺 ∈ 𝑉 ∧ Fun 𝐺))) → (𝐹 finSupp 𝑍 ↔ (𝐹 supp 𝑍) ∈ Fin))
6	5	adantr 480	. . . 4 ⊢ (((𝑍 ∈ V ∧ ((𝐹 ∈ 𝑈 ∧ Fun 𝐹) ∧ (𝐺 ∈ 𝑉 ∧ Fun 𝐺))) ∧ (𝐹 supp 𝑍) = (𝐺 supp 𝑍)) → (𝐹 finSupp 𝑍 ↔ (𝐹 supp 𝑍) ∈ Fin))
7		simpr 484	. . . . . . . . . 10 ⊢ ((𝐺 ∈ 𝑉 ∧ Fun 𝐺) → Fun 𝐺)
8	7	adantr 480	. . . . . . . . 9 ⊢ (((𝐺 ∈ 𝑉 ∧ Fun 𝐺) ∧ 𝑍 ∈ V) → Fun 𝐺)
9		simpl 482	. . . . . . . . . 10 ⊢ ((𝐺 ∈ 𝑉 ∧ Fun 𝐺) → 𝐺 ∈ 𝑉)
10	9	adantr 480	. . . . . . . . 9 ⊢ (((𝐺 ∈ 𝑉 ∧ Fun 𝐺) ∧ 𝑍 ∈ V) → 𝐺 ∈ 𝑉)
11		simpr 484	. . . . . . . . 9 ⊢ (((𝐺 ∈ 𝑉 ∧ Fun 𝐺) ∧ 𝑍 ∈ V) → 𝑍 ∈ V)
12		funisfsupp 9257	. . . . . . . . 9 ⊢ ((Fun 𝐺 ∧ 𝐺 ∈ 𝑉 ∧ 𝑍 ∈ V) → (𝐺 finSupp 𝑍 ↔ (𝐺 supp 𝑍) ∈ Fin))
13	8, 10, 11, 12	syl3anc 1373	. . . . . . . 8 ⊢ (((𝐺 ∈ 𝑉 ∧ Fun 𝐺) ∧ 𝑍 ∈ V) → (𝐺 finSupp 𝑍 ↔ (𝐺 supp 𝑍) ∈ Fin))
14	13	ex 412	. . . . . . 7 ⊢ ((𝐺 ∈ 𝑉 ∧ Fun 𝐺) → (𝑍 ∈ V → (𝐺 finSupp 𝑍 ↔ (𝐺 supp 𝑍) ∈ Fin)))
15	14	adantl 481	. . . . . 6 ⊢ (((𝐹 ∈ 𝑈 ∧ Fun 𝐹) ∧ (𝐺 ∈ 𝑉 ∧ Fun 𝐺)) → (𝑍 ∈ V → (𝐺 finSupp 𝑍 ↔ (𝐺 supp 𝑍) ∈ Fin)))
16	15	impcom 407	. . . . 5 ⊢ ((𝑍 ∈ V ∧ ((𝐹 ∈ 𝑈 ∧ Fun 𝐹) ∧ (𝐺 ∈ 𝑉 ∧ Fun 𝐺))) → (𝐺 finSupp 𝑍 ↔ (𝐺 supp 𝑍) ∈ Fin))
17		eleq1 2816	. . . . . 6 ⊢ ((𝐹 supp 𝑍) = (𝐺 supp 𝑍) → ((𝐹 supp 𝑍) ∈ Fin ↔ (𝐺 supp 𝑍) ∈ Fin))
18	17	bicomd 223	. . . . 5 ⊢ ((𝐹 supp 𝑍) = (𝐺 supp 𝑍) → ((𝐺 supp 𝑍) ∈ Fin ↔ (𝐹 supp 𝑍) ∈ Fin))
19	16, 18	sylan9bb 509	. . . 4 ⊢ (((𝑍 ∈ V ∧ ((𝐹 ∈ 𝑈 ∧ Fun 𝐹) ∧ (𝐺 ∈ 𝑉 ∧ Fun 𝐺))) ∧ (𝐹 supp 𝑍) = (𝐺 supp 𝑍)) → (𝐺 finSupp 𝑍 ↔ (𝐹 supp 𝑍) ∈ Fin))
20	6, 19	bitr4d 282	. . 3 ⊢ (((𝑍 ∈ V ∧ ((𝐹 ∈ 𝑈 ∧ Fun 𝐹) ∧ (𝐺 ∈ 𝑉 ∧ Fun 𝐺))) ∧ (𝐹 supp 𝑍) = (𝐺 supp 𝑍)) → (𝐹 finSupp 𝑍 ↔ 𝐺 finSupp 𝑍))
21	20	exp31 419	. 2 ⊢ (𝑍 ∈ V → (((𝐹 ∈ 𝑈 ∧ Fun 𝐹) ∧ (𝐺 ∈ 𝑉 ∧ Fun 𝐺)) → ((𝐹 supp 𝑍) = (𝐺 supp 𝑍) → (𝐹 finSupp 𝑍 ↔ 𝐺 finSupp 𝑍))))
22		relfsupp 9253	. . . . 5 ⊢ Rel finSupp
23	22	brrelex2i 5676	. . . 4 ⊢ (𝐹 finSupp 𝑍 → 𝑍 ∈ V)
24	22	brrelex2i 5676	. . . 4 ⊢ (𝐺 finSupp 𝑍 → 𝑍 ∈ V)
25	23, 24	pm5.21ni 377	. . 3 ⊢ (¬ 𝑍 ∈ V → (𝐹 finSupp 𝑍 ↔ 𝐺 finSupp 𝑍))
26	25	2a1d 26	. 2 ⊢ (¬ 𝑍 ∈ V → (((𝐹 ∈ 𝑈 ∧ Fun 𝐹) ∧ (𝐺 ∈ 𝑉 ∧ Fun 𝐺)) → ((𝐹 supp 𝑍) = (𝐺 supp 𝑍) → (𝐹 finSupp 𝑍 ↔ 𝐺 finSupp 𝑍))))
27	21, 26	pm2.61i 182	1 ⊢ (((𝐹 ∈ 𝑈 ∧ Fun 𝐹) ∧ (𝐺 ∈ 𝑉 ∧ Fun 𝐺)) → ((𝐹 supp 𝑍) = (𝐺 supp 𝑍) → (𝐹 finSupp 𝑍 ↔ 𝐺 finSupp 𝑍)))

Syntax hints:  ¬ wn 3   → wi 4   ↔ wb 206   ∧ wa 395   = wceq 1540   ∈ wcel 2109  Vcvv 3436   class class class wbr 5092  Fun wfun 6476  (class class class)co 7349   supp csupp 8093  Fincfn 8872   finSupp cfsupp 9251

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 1967  ax-7 2008  ax-8 2111  ax-9 2119  ax-ext 2701  ax-sep 5235  ax-nul 5245  ax-pr 5371

This theorem depends on definitions:  df-bi 207  df-an 396  df-or 848  df-3an 1088  df-tru 1543  df-fal 1553  df-ex 1780  df-sb 2066  df-clab 2708  df-cleq 2721  df-clel 2803  df-ral 3045  df-rex 3054  df-rab 3395  df-v 3438  df-dif 3906  df-un 3908  df-ss 3920  df-nul 4285  df-if 4477  df-sn 4578  df-pr 4580  df-op 4584  df-uni 4859  df-br 5093  df-opab 5155  df-xp 5625  df-rel 5626  df-cnv 5627  df-co 5628  df-iota 6438  df-fun 6484  df-fv 6490  df-ov 7352  df-fsupp 9252

This theorem is referenced by:  cantnfrescl  9572