Theorem fvconstr 48770

Description: Two ways of expressing 𝐴𝑅𝐵. (Contributed by Zhi Wang, 18-Sep-2024.)

Hypotheses

Ref	Expression
fvconstr.1	⊢ (𝜑 → 𝐹 = (𝑅 × {𝑌}))
fvconstr.2	⊢ (𝜑 → 𝑌 ∈ 𝑉)
fvconstr.3	⊢ (𝜑 → 𝑌 ≠ ∅)

Assertion

Ref	Expression
fvconstr	⊢ (𝜑 → (𝐴𝑅𝐵 ↔ (𝐴𝐹𝐵) = 𝑌))

Proof of Theorem fvconstr

Step	Hyp	Ref	Expression
1		df-br 5143	. 2 ⊢ (𝐴𝑅𝐵 ↔ ⟨𝐴, 𝐵⟩ ∈ 𝑅)
2		fvconstr.1	. . . . . . 7 ⊢ (𝜑 → 𝐹 = (𝑅 × {𝑌}))
3	2	oveqd 7449	. . . . . 6 ⊢ (𝜑 → (𝐴𝐹𝐵) = (𝐴(𝑅 × {𝑌})𝐵))
4		df-ov 7435	. . . . . 6 ⊢ (𝐴(𝑅 × {𝑌})𝐵) = ((𝑅 × {𝑌})‘⟨𝐴, 𝐵⟩)
5	3, 4	eqtrdi 2792	. . . . 5 ⊢ (𝜑 → (𝐴𝐹𝐵) = ((𝑅 × {𝑌})‘⟨𝐴, 𝐵⟩))
6	5	adantr 480	. . . 4 ⊢ ((𝜑 ∧ ⟨𝐴, 𝐵⟩ ∈ 𝑅) → (𝐴𝐹𝐵) = ((𝑅 × {𝑌})‘⟨𝐴, 𝐵⟩))
7		fvconstr.2	. . . . 5 ⊢ (𝜑 → 𝑌 ∈ 𝑉)
8		fvconst2g 7223	. . . . 5 ⊢ ((𝑌 ∈ 𝑉 ∧ ⟨𝐴, 𝐵⟩ ∈ 𝑅) → ((𝑅 × {𝑌})‘⟨𝐴, 𝐵⟩) = 𝑌)
9	7, 8	sylan 580	. . . 4 ⊢ ((𝜑 ∧ ⟨𝐴, 𝐵⟩ ∈ 𝑅) → ((𝑅 × {𝑌})‘⟨𝐴, 𝐵⟩) = 𝑌)
10	6, 9	eqtrd 2776	. . 3 ⊢ ((𝜑 ∧ ⟨𝐴, 𝐵⟩ ∈ 𝑅) → (𝐴𝐹𝐵) = 𝑌)
11		simpr 484	. . . . . 6 ⊢ ((𝜑 ∧ (𝐴𝐹𝐵) = 𝑌) → (𝐴𝐹𝐵) = 𝑌)
12		fvconstr.3	. . . . . . 7 ⊢ (𝜑 → 𝑌 ≠ ∅)
13	12	adantr 480	. . . . . 6 ⊢ ((𝜑 ∧ (𝐴𝐹𝐵) = 𝑌) → 𝑌 ≠ ∅)
14	11, 13	eqnetrd 3007	. . . . 5 ⊢ ((𝜑 ∧ (𝐴𝐹𝐵) = 𝑌) → (𝐴𝐹𝐵) ≠ ∅)
15	5	neeq1d 2999	. . . . . 6 ⊢ (𝜑 → ((𝐴𝐹𝐵) ≠ ∅ ↔ ((𝑅 × {𝑌})‘⟨𝐴, 𝐵⟩) ≠ ∅))
16	15	adantr 480	. . . . 5 ⊢ ((𝜑 ∧ (𝐴𝐹𝐵) = 𝑌) → ((𝐴𝐹𝐵) ≠ ∅ ↔ ((𝑅 × {𝑌})‘⟨𝐴, 𝐵⟩) ≠ ∅))
17	14, 16	mpbid 232	. . . 4 ⊢ ((𝜑 ∧ (𝐴𝐹𝐵) = 𝑌) → ((𝑅 × {𝑌})‘⟨𝐴, 𝐵⟩) ≠ ∅)
18		dmxpss 6190	. . . . 5 ⊢ dom (𝑅 × {𝑌}) ⊆ 𝑅
19		ndmfv 6940	. . . . . 6 ⊢ (¬ ⟨𝐴, 𝐵⟩ ∈ dom (𝑅 × {𝑌}) → ((𝑅 × {𝑌})‘⟨𝐴, 𝐵⟩) = ∅)
20	19	necon1ai 2967	. . . . 5 ⊢ (((𝑅 × {𝑌})‘⟨𝐴, 𝐵⟩) ≠ ∅ → ⟨𝐴, 𝐵⟩ ∈ dom (𝑅 × {𝑌}))
21	18, 20	sselid 3980	. . . 4 ⊢ (((𝑅 × {𝑌})‘⟨𝐴, 𝐵⟩) ≠ ∅ → ⟨𝐴, 𝐵⟩ ∈ 𝑅)
22	17, 21	syl 17	. . 3 ⊢ ((𝜑 ∧ (𝐴𝐹𝐵) = 𝑌) → ⟨𝐴, 𝐵⟩ ∈ 𝑅)
23	10, 22	impbida 800	. 2 ⊢ (𝜑 → (⟨𝐴, 𝐵⟩ ∈ 𝑅 ↔ (𝐴𝐹𝐵) = 𝑌))
24	1, 23	bitrid 283	1 ⊢ (𝜑 → (𝐴𝑅𝐵 ↔ (𝐴𝐹𝐵) = 𝑌))

Syntax hints:   → wi 4   ↔ wb 206   ∧ wa 395   = wceq 1539   ∈ wcel 2107   ≠ wne 2939  ∅c0 4332  {csn 4625  ⟨cop 4631   class class class wbr 5142   × cxp 5682  dom cdm 5684  ‘cfv 6560  (class class class)co 7432

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1794  ax-4 1808  ax-5 1909  ax-6 1966  ax-7 2006  ax-8 2109  ax-9 2117  ax-10 2140  ax-11 2156  ax-12 2176  ax-ext 2707  ax-sep 5295  ax-nul 5305  ax-pr 5431

This theorem depends on definitions:  df-bi 207  df-an 396  df-or 848  df-3an 1088  df-tru 1542  df-fal 1552  df-ex 1779  df-nf 1783  df-sb 2064  df-mo 2539  df-eu 2568  df-clab 2714  df-cleq 2728  df-clel 2815  df-nfc 2891  df-ne 2940  df-ral 3061  df-rex 3070  df-rab 3436  df-v 3481  df-dif 3953  df-un 3955  df-ss 3967  df-nul 4333  df-if 4525  df-sn 4626  df-pr 4628  df-op 4632  df-uni 4907  df-br 5143  df-opab 5205  df-mpt 5225  df-id 5577  df-xp 5690  df-rel 5691  df-cnv 5692  df-co 5693  df-dm 5694  df-rn 5695  df-iota 6513  df-fun 6562  df-fn 6563  df-f 6564  df-fv 6568  df-ov 7435

This theorem is referenced by:  prsthinc  49136  prstchom2ALT  49216