Theorem suppeqfsuppbi 9335

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 791	. . . . . 6 ⊢ ((𝑍 ∈ V ∧ ((𝐹 ∈ 𝑈 ∧ Fun 𝐹) ∧ (𝐺 ∈ 𝑉 ∧ Fun 𝐺))) → Fun 𝐹)
2		simprll 790	. . . . . 6 ⊢ ((𝑍 ∈ V ∧ ((𝐹 ∈ 𝑈 ∧ Fun 𝐹) ∧ (𝐺 ∈ 𝑉 ∧ Fun 𝐺))) → 𝐹 ∈ 𝑈)
3		simpl 487	. . . . . 6 ⊢ ((𝑍 ∈ V ∧ ((𝐹 ∈ 𝑈 ∧ Fun 𝐹) ∧ (𝐺 ∈ 𝑉 ∧ Fun 𝐺))) → 𝑍 ∈ V)
4		funisfsupp 9323	. . . . . 6 ⊢ ((Fun 𝐹 ∧ 𝐹 ∈ 𝑈 ∧ 𝑍 ∈ V) → (𝐹 finSupp 𝑍 ↔ (𝐹 supp 𝑍) ∈ Fin))
5	1, 2, 3, 4	syl3anc 1398	. . . . 5 ⊢ ((𝑍 ∈ V ∧ ((𝐹 ∈ 𝑈 ∧ Fun 𝐹) ∧ (𝐺 ∈ 𝑉 ∧ Fun 𝐺))) → (𝐹 finSupp 𝑍 ↔ (𝐹 supp 𝑍) ∈ Fin))
6	5	adantr 485	. . . 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 489	. . . . . . . . . 10 ⊢ ((𝐺 ∈ 𝑉 ∧ Fun 𝐺) → Fun 𝐺)
8	7	adantr 485	. . . . . . . . 9 ⊢ (((𝐺 ∈ 𝑉 ∧ Fun 𝐺) ∧ 𝑍 ∈ V) → Fun 𝐺)
9		simpl 487	. . . . . . . . . 10 ⊢ ((𝐺 ∈ 𝑉 ∧ Fun 𝐺) → 𝐺 ∈ 𝑉)
10	9	adantr 485	. . . . . . . . 9 ⊢ (((𝐺 ∈ 𝑉 ∧ Fun 𝐺) ∧ 𝑍 ∈ V) → 𝐺 ∈ 𝑉)
11		simpr 489	. . . . . . . . 9 ⊢ (((𝐺 ∈ 𝑉 ∧ Fun 𝐺) ∧ 𝑍 ∈ V) → 𝑍 ∈ V)
12		funisfsupp 9323	. . . . . . . . 9 ⊢ ((Fun 𝐺 ∧ 𝐺 ∈ 𝑉 ∧ 𝑍 ∈ V) → (𝐺 finSupp 𝑍 ↔ (𝐺 supp 𝑍) ∈ Fin))
13	8, 10, 11, 12	syl3anc 1398	. . . . . . . 8 ⊢ (((𝐺 ∈ 𝑉 ∧ Fun 𝐺) ∧ 𝑍 ∈ V) → (𝐺 finSupp 𝑍 ↔ (𝐺 supp 𝑍) ∈ Fin))
14	13	ex 417	. . . . . . 7 ⊢ ((𝐺 ∈ 𝑉 ∧ Fun 𝐺) → (𝑍 ∈ V → (𝐺 finSupp 𝑍 ↔ (𝐺 supp 𝑍) ∈ Fin)))
15	14	adantl 486	. . . . . 6 ⊢ (((𝐹 ∈ 𝑈 ∧ Fun 𝐹) ∧ (𝐺 ∈ 𝑉 ∧ Fun 𝐺)) → (𝑍 ∈ V → (𝐺 finSupp 𝑍 ↔ (𝐺 supp 𝑍) ∈ Fin)))
16	15	impcom 412	. . . . 5 ⊢ ((𝑍 ∈ V ∧ ((𝐹 ∈ 𝑈 ∧ Fun 𝐹) ∧ (𝐺 ∈ 𝑉 ∧ Fun 𝐺))) → (𝐺 finSupp 𝑍 ↔ (𝐺 supp 𝑍) ∈ Fin))
17		eleq1 2851	. . . . . 6 ⊢ ((𝐹 supp 𝑍) = (𝐺 supp 𝑍) → ((𝐹 supp 𝑍) ∈ Fin ↔ (𝐺 supp 𝑍) ∈ Fin))
18	17	bicomd 226	. . . . 5 ⊢ ((𝐹 supp 𝑍) = (𝐺 supp 𝑍) → ((𝐺 supp 𝑍) ∈ Fin ↔ (𝐹 supp 𝑍) ∈ Fin))
19	16, 18	sylan9bb 518	. . . 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 285	. . 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 424	. 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 9319	. . . . 5 ⊢ Rel finSupp
23	22	brrelex2i 5718	. . . 4 ⊢ (𝐹 finSupp 𝑍 → 𝑍 ∈ V)
24	22	brrelex2i 5718	. . . 4 ⊢ (𝐺 finSupp 𝑍 → 𝑍 ∈ V)
25	23, 24	pm5.21ni 380	. . 3 ⊢ (¬ 𝑍 ∈ V → (𝐹 finSupp 𝑍 ↔ 𝐺 finSupp 𝑍))
26	25	2a1d 27	. 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 184	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 209   ∧ wa 400   = wceq 1570   ∈ wcel 2143  Vcvv 3455   class class class wbr 5109  Fun wfun 6530  (class class class)co 7410   supp csupp 8152  Fincfn 8939   finSupp cfsupp 9317

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1825  ax-4 1839  ax-5 1940  ax-6 1997  ax-7 2038  ax-8 2145  ax-9 2153  ax-ext 2735  ax-sep 5257  ax-pr 5404

This theorem depends on definitions:  df-bi 210  df-an 401  df-or 861  df-3an 1105  df-tru 1573  df-fal 1583  df-ex 1810  df-sb 2097  df-clab 2742  df-cleq 2755  df-clel 2838  df-ral 3080  df-rex 3090  df-rab 3417  df-v 3457  df-dif 3908  df-un 3910  df-in 3912  df-ss 3922  df-nul 4287  df-if 4488  df-sn 4590  df-pr 4592  df-op 4596  df-uni 4873  df-br 5110  df-opab 5174  df-xp 5667  df-rel 5668  df-cnv 5669  df-co 5670  df-iota 6492  df-fun 6538  df-fv 6544  df-ov 7413  df-fsupp 9318

This theorem is referenced by:  cantnfrescl  9641