Theorem ffnafv 47634

Description: A function maps to a class to which all values belong, analogous to ffnfv 7066. (Contributed by Alexander van der Vekens, 25-May-2017.)

Assertion

Ref	Expression
ffnafv	⊢ (𝐹:𝐴⟶𝐵 ↔ (𝐹 Fn 𝐴 ∧ ∀𝑥 ∈ 𝐴 (𝐹'''𝑥) ∈ 𝐵))

Distinct variable groups:   𝑥,𝐴   𝑥,𝐵   𝑥,𝐹

Proof of Theorem ffnafv

Dummy variable 𝑦 is distinct from all other variables.

Step	Hyp	Ref	Expression
1		ffn 6663	. . 3 ⊢ (𝐹:𝐴⟶𝐵 → 𝐹 Fn 𝐴)
2		fafvelcdm 47633	. . . 4 ⊢ ((𝐹:𝐴⟶𝐵 ∧ 𝑥 ∈ 𝐴) → (𝐹'''𝑥) ∈ 𝐵)
3	2	ralrimiva 3130	. . 3 ⊢ (𝐹:𝐴⟶𝐵 → ∀𝑥 ∈ 𝐴 (𝐹'''𝑥) ∈ 𝐵)
4	1, 3	jca 511	. 2 ⊢ (𝐹:𝐴⟶𝐵 → (𝐹 Fn 𝐴 ∧ ∀𝑥 ∈ 𝐴 (𝐹'''𝑥) ∈ 𝐵))
5		simpl 482	. . 3 ⊢ ((𝐹 Fn 𝐴 ∧ ∀𝑥 ∈ 𝐴 (𝐹'''𝑥) ∈ 𝐵) → 𝐹 Fn 𝐴)
6		afvelrnb0 47627	. . . . 5 ⊢ (𝐹 Fn 𝐴 → (𝑦 ∈ ran 𝐹 → ∃𝑥 ∈ 𝐴 (𝐹'''𝑥) = 𝑦))
7		nfra1 3262	. . . . . 6 ⊢ Ⅎ𝑥∀𝑥 ∈ 𝐴 (𝐹'''𝑥) ∈ 𝐵
8		nfv 1916	. . . . . 6 ⊢ Ⅎ𝑥 𝑦 ∈ 𝐵
9		rsp 3226	. . . . . . 7 ⊢ (∀𝑥 ∈ 𝐴 (𝐹'''𝑥) ∈ 𝐵 → (𝑥 ∈ 𝐴 → (𝐹'''𝑥) ∈ 𝐵))
10		eleq1 2825	. . . . . . . 8 ⊢ ((𝐹'''𝑥) = 𝑦 → ((𝐹'''𝑥) ∈ 𝐵 ↔ 𝑦 ∈ 𝐵))
11	10	biimpcd 249	. . . . . . 7 ⊢ ((𝐹'''𝑥) ∈ 𝐵 → ((𝐹'''𝑥) = 𝑦 → 𝑦 ∈ 𝐵))
12	9, 11	syl6 35	. . . . . 6 ⊢ (∀𝑥 ∈ 𝐴 (𝐹'''𝑥) ∈ 𝐵 → (𝑥 ∈ 𝐴 → ((𝐹'''𝑥) = 𝑦 → 𝑦 ∈ 𝐵)))
13	7, 8, 12	rexlimd 3245	. . . . 5 ⊢ (∀𝑥 ∈ 𝐴 (𝐹'''𝑥) ∈ 𝐵 → (∃𝑥 ∈ 𝐴 (𝐹'''𝑥) = 𝑦 → 𝑦 ∈ 𝐵))
14	6, 13	sylan9 507	. . . 4 ⊢ ((𝐹 Fn 𝐴 ∧ ∀𝑥 ∈ 𝐴 (𝐹'''𝑥) ∈ 𝐵) → (𝑦 ∈ ran 𝐹 → 𝑦 ∈ 𝐵))
15	14	ssrdv 3928	. . 3 ⊢ ((𝐹 Fn 𝐴 ∧ ∀𝑥 ∈ 𝐴 (𝐹'''𝑥) ∈ 𝐵) → ran 𝐹 ⊆ 𝐵)
16		df-f 6497	. . 3 ⊢ (𝐹:𝐴⟶𝐵 ↔ (𝐹 Fn 𝐴 ∧ ran 𝐹 ⊆ 𝐵))
17	5, 15, 16	sylanbrc 584	. 2 ⊢ ((𝐹 Fn 𝐴 ∧ ∀𝑥 ∈ 𝐴 (𝐹'''𝑥) ∈ 𝐵) → 𝐹:𝐴⟶𝐵)
18	4, 17	impbii 209	1 ⊢ (𝐹:𝐴⟶𝐵 ↔ (𝐹 Fn 𝐴 ∧ ∀𝑥 ∈ 𝐴 (𝐹'''𝑥) ∈ 𝐵))

Syntax hints:   → wi 4   ↔ wb 206   ∧ wa 395   = wceq 1542   ∈ wcel 2114  ∀wral 3052  ∃wrex 3062   ⊆ wss 3890  ran crn 5626   Fn wfn 6488  ⟶wf 6489  '''cafv 47580

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1797  ax-4 1811  ax-5 1912  ax-6 1969  ax-7 2010  ax-8 2116  ax-9 2124  ax-10 2147  ax-11 2163  ax-12 2185  ax-ext 2709  ax-sep 5232  ax-nul 5242  ax-pr 5371

This theorem depends on definitions:  df-bi 207  df-an 396  df-or 849  df-3an 1089  df-tru 1545  df-fal 1555  df-ex 1782  df-nf 1786  df-sb 2069  df-mo 2540  df-eu 2570  df-clab 2716  df-cleq 2729  df-clel 2812  df-nfc 2886  df-ne 2934  df-ral 3053  df-rex 3063  df-rab 3391  df-v 3432  df-sbc 3730  df-csb 3839  df-dif 3893  df-un 3895  df-in 3897  df-ss 3907  df-nul 4275  df-if 4468  df-sn 4569  df-pr 4571  df-op 4575  df-uni 4852  df-int 4891  df-br 5087  df-opab 5149  df-mpt 5168  df-id 5520  df-xp 5631  df-rel 5632  df-cnv 5633  df-co 5634  df-dm 5635  df-rn 5636  df-res 5637  df-iota 6449  df-fun 6495  df-fn 6496  df-f 6497  df-fv 6501  df-aiota 47548  df-dfat 47582  df-afv 47583

This theorem is referenced by:  ffnaov  47662