Theorem ffnafv 39900

Description: A function maps to a class to which all values belong, analogous to ffnfv 6295. (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 5958	. . 3 ⊢ (𝐹:𝐴⟶𝐵 → 𝐹 Fn 𝐴)
2		fafvelrn 39899	. . . 4 ⊢ ((𝐹:𝐴⟶𝐵 ∧ 𝑥 ∈ 𝐴) → (𝐹'''𝑥) ∈ 𝐵)
3	2	ralrimiva 2949	. . 3 ⊢ (𝐹:𝐴⟶𝐵 → ∀𝑥 ∈ 𝐴 (𝐹'''𝑥) ∈ 𝐵)
4	1, 3	jca 553	. 2 ⊢ (𝐹:𝐴⟶𝐵 → (𝐹 Fn 𝐴 ∧ ∀𝑥 ∈ 𝐴 (𝐹'''𝑥) ∈ 𝐵))
5		simpl 472	. . 3 ⊢ ((𝐹 Fn 𝐴 ∧ ∀𝑥 ∈ 𝐴 (𝐹'''𝑥) ∈ 𝐵) → 𝐹 Fn 𝐴)
6		afvelrnb0 39893	. . . . 5 ⊢ (𝐹 Fn 𝐴 → (𝑦 ∈ ran 𝐹 → ∃𝑥 ∈ 𝐴 (𝐹'''𝑥) = 𝑦))
7		nfra1 2925	. . . . . 6 ⊢ Ⅎ𝑥∀𝑥 ∈ 𝐴 (𝐹'''𝑥) ∈ 𝐵
8		nfv 1830	. . . . . 6 ⊢ Ⅎ𝑥 𝑦 ∈ 𝐵
9		rsp 2913	. . . . . . 7 ⊢ (∀𝑥 ∈ 𝐴 (𝐹'''𝑥) ∈ 𝐵 → (𝑥 ∈ 𝐴 → (𝐹'''𝑥) ∈ 𝐵))
10		eleq1 2676	. . . . . . . 8 ⊢ ((𝐹'''𝑥) = 𝑦 → ((𝐹'''𝑥) ∈ 𝐵 ↔ 𝑦 ∈ 𝐵))
11	10	biimpcd 238	. . . . . . 7 ⊢ ((𝐹'''𝑥) ∈ 𝐵 → ((𝐹'''𝑥) = 𝑦 → 𝑦 ∈ 𝐵))
12	9, 11	syl6 34	. . . . . 6 ⊢ (∀𝑥 ∈ 𝐴 (𝐹'''𝑥) ∈ 𝐵 → (𝑥 ∈ 𝐴 → ((𝐹'''𝑥) = 𝑦 → 𝑦 ∈ 𝐵)))
13	7, 8, 12	rexlimd 3008	. . . . 5 ⊢ (∀𝑥 ∈ 𝐴 (𝐹'''𝑥) ∈ 𝐵 → (∃𝑥 ∈ 𝐴 (𝐹'''𝑥) = 𝑦 → 𝑦 ∈ 𝐵))
14	6, 13	sylan9 687	. . . 4 ⊢ ((𝐹 Fn 𝐴 ∧ ∀𝑥 ∈ 𝐴 (𝐹'''𝑥) ∈ 𝐵) → (𝑦 ∈ ran 𝐹 → 𝑦 ∈ 𝐵))
15	14	ssrdv 3574	. . 3 ⊢ ((𝐹 Fn 𝐴 ∧ ∀𝑥 ∈ 𝐴 (𝐹'''𝑥) ∈ 𝐵) → ran 𝐹 ⊆ 𝐵)
16		df-f 5808	. . 3 ⊢ (𝐹:𝐴⟶𝐵 ↔ (𝐹 Fn 𝐴 ∧ ran 𝐹 ⊆ 𝐵))
17	5, 15, 16	sylanbrc 695	. 2 ⊢ ((𝐹 Fn 𝐴 ∧ ∀𝑥 ∈ 𝐴 (𝐹'''𝑥) ∈ 𝐵) → 𝐹:𝐴⟶𝐵)
18	4, 17	impbii 198	1 ⊢ (𝐹:𝐴⟶𝐵 ↔ (𝐹 Fn 𝐴 ∧ ∀𝑥 ∈ 𝐴 (𝐹'''𝑥) ∈ 𝐵))

Syntax hints:   → wi 4   ↔ wb 195   ∧ wa 383   = wceq 1475   ∈ wcel 1977  ∀wral 2896  ∃wrex 2897   ⊆ wss 3540  ran crn 5039   Fn wfn 5799  ⟶wf 5800  '''cafv 39843

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1713  ax-4 1728  ax-5 1827  ax-6 1875  ax-7 1922  ax-9 1986  ax-10 2006  ax-11 2021  ax-12 2034  ax-13 2234  ax-ext 2590  ax-sep 4709  ax-nul 4717  ax-pr 4833

This theorem depends on definitions:  df-bi 196  df-or 384  df-an 385  df-3an 1033  df-tru 1478  df-ex 1696  df-nf 1701  df-sb 1868  df-eu 2462  df-mo 2463  df-clab 2597  df-cleq 2603  df-clel 2606  df-nfc 2740  df-ral 2901  df-rex 2902  df-rab 2905  df-v 3175  df-sbc 3403  df-dif 3543  df-un 3545  df-in 3547  df-ss 3554  df-nul 3875  df-if 4037  df-sn 4126  df-pr 4128  df-op 4132  df-uni 4373  df-br 4584  df-opab 4644  df-mpt 4645  df-id 4953  df-xp 5044  df-rel 5045  df-cnv 5046  df-co 5047  df-dm 5048  df-rn 5049  df-res 5050  df-iota 5768  df-fun 5806  df-fn 5807  df-f 5808  df-fv 5812  df-dfat 39845  df-afv 39846

This theorem is referenced by:  ffnaov  39928