Theorem marypha2lem2 9387

Description: Lemma for marypha2 9390. Properties of the used relation. (Contributed by Stefan O'Rear, 20-Feb-2015.)

Hypothesis

Ref	Expression
marypha2lem.t	⊢ 𝑇 = ∪ 𝑥 ∈ 𝐴 ({𝑥} × (𝐹‘𝑥))

Assertion

Ref	Expression
marypha2lem2	⊢ 𝑇 = {⟨𝑥, 𝑦⟩ ∣ (𝑥 ∈ 𝐴 ∧ 𝑦 ∈ (𝐹‘𝑥))}

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

Allowed substitution hints:   𝑇(𝑥,𝑦)

Proof of Theorem marypha2lem2

Dummy variable 𝑧 is distinct from all other variables.

Step	Hyp	Ref	Expression
1		marypha2lem.t	. 2 ⊢ 𝑇 = ∪ 𝑥 ∈ 𝐴 ({𝑥} × (𝐹‘𝑥))
2		sneq 4599	. . . 4 ⊢ (𝑥 = 𝑧 → {𝑥} = {𝑧})
3		fveq2 6858	. . . 4 ⊢ (𝑥 = 𝑧 → (𝐹‘𝑥) = (𝐹‘𝑧))
4	2, 3	xpeq12d 5669	. . 3 ⊢ (𝑥 = 𝑧 → ({𝑥} × (𝐹‘𝑥)) = ({𝑧} × (𝐹‘𝑧)))
5	4	cbviunv 5004	. 2 ⊢ ∪ 𝑥 ∈ 𝐴 ({𝑥} × (𝐹‘𝑥)) = ∪ 𝑧 ∈ 𝐴 ({𝑧} × (𝐹‘𝑧))
6		df-xp 5644	. . . . 5 ⊢ ({𝑧} × (𝐹‘𝑧)) = {⟨𝑥, 𝑦⟩ ∣ (𝑥 ∈ {𝑧} ∧ 𝑦 ∈ (𝐹‘𝑧))}
7	6	a1i 11	. . . 4 ⊢ (𝑧 ∈ 𝐴 → ({𝑧} × (𝐹‘𝑧)) = {⟨𝑥, 𝑦⟩ ∣ (𝑥 ∈ {𝑧} ∧ 𝑦 ∈ (𝐹‘𝑧))})
8	7	iuneq2i 4977	. . 3 ⊢ ∪ 𝑧 ∈ 𝐴 ({𝑧} × (𝐹‘𝑧)) = ∪ 𝑧 ∈ 𝐴 {⟨𝑥, 𝑦⟩ ∣ (𝑥 ∈ {𝑧} ∧ 𝑦 ∈ (𝐹‘𝑧))}
9		iunopab 5519	. . 3 ⊢ ∪ 𝑧 ∈ 𝐴 {⟨𝑥, 𝑦⟩ ∣ (𝑥 ∈ {𝑧} ∧ 𝑦 ∈ (𝐹‘𝑧))} = {⟨𝑥, 𝑦⟩ ∣ ∃𝑧 ∈ 𝐴 (𝑥 ∈ {𝑧} ∧ 𝑦 ∈ (𝐹‘𝑧))}
10		velsn 4605	. . . . . . . 8 ⊢ (𝑥 ∈ {𝑧} ↔ 𝑥 = 𝑧)
11		equcom 2018	. . . . . . . 8 ⊢ (𝑥 = 𝑧 ↔ 𝑧 = 𝑥)
12	10, 11	bitri 275	. . . . . . 7 ⊢ (𝑥 ∈ {𝑧} ↔ 𝑧 = 𝑥)
13	12	anbi1i 624	. . . . . 6 ⊢ ((𝑥 ∈ {𝑧} ∧ 𝑦 ∈ (𝐹‘𝑧)) ↔ (𝑧 = 𝑥 ∧ 𝑦 ∈ (𝐹‘𝑧)))
14	13	rexbii 3076	. . . . 5 ⊢ (∃𝑧 ∈ 𝐴 (𝑥 ∈ {𝑧} ∧ 𝑦 ∈ (𝐹‘𝑧)) ↔ ∃𝑧 ∈ 𝐴 (𝑧 = 𝑥 ∧ 𝑦 ∈ (𝐹‘𝑧)))
15		fveq2 6858	. . . . . . 7 ⊢ (𝑧 = 𝑥 → (𝐹‘𝑧) = (𝐹‘𝑥))
16	15	eleq2d 2814	. . . . . 6 ⊢ (𝑧 = 𝑥 → (𝑦 ∈ (𝐹‘𝑧) ↔ 𝑦 ∈ (𝐹‘𝑥)))
17	16	ceqsrexbv 3622	. . . . 5 ⊢ (∃𝑧 ∈ 𝐴 (𝑧 = 𝑥 ∧ 𝑦 ∈ (𝐹‘𝑧)) ↔ (𝑥 ∈ 𝐴 ∧ 𝑦 ∈ (𝐹‘𝑥)))
18	14, 17	bitri 275	. . . 4 ⊢ (∃𝑧 ∈ 𝐴 (𝑥 ∈ {𝑧} ∧ 𝑦 ∈ (𝐹‘𝑧)) ↔ (𝑥 ∈ 𝐴 ∧ 𝑦 ∈ (𝐹‘𝑥)))
19	18	opabbii 5174	. . 3 ⊢ {⟨𝑥, 𝑦⟩ ∣ ∃𝑧 ∈ 𝐴 (𝑥 ∈ {𝑧} ∧ 𝑦 ∈ (𝐹‘𝑧))} = {⟨𝑥, 𝑦⟩ ∣ (𝑥 ∈ 𝐴 ∧ 𝑦 ∈ (𝐹‘𝑥))}
20	8, 9, 19	3eqtri 2756	. 2 ⊢ ∪ 𝑧 ∈ 𝐴 ({𝑧} × (𝐹‘𝑧)) = {⟨𝑥, 𝑦⟩ ∣ (𝑥 ∈ 𝐴 ∧ 𝑦 ∈ (𝐹‘𝑥))}
21	1, 5, 20	3eqtri 2756	1 ⊢ 𝑇 = {⟨𝑥, 𝑦⟩ ∣ (𝑥 ∈ 𝐴 ∧ 𝑦 ∈ (𝐹‘𝑥))}

Syntax hints:   ∧ wa 395   = wceq 1540   ∈ wcel 2109  ∃wrex 3053  {csn 4589  ∪ ciun 4955  {copab 5169   × cxp 5636  ‘cfv 6511

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-11 2158  ax-ext 2701

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 3406  df-v 3449  df-dif 3917  df-un 3919  df-ss 3931  df-nul 4297  df-if 4489  df-sn 4590  df-pr 4592  df-op 4596  df-uni 4872  df-iun 4957  df-br 5108  df-opab 5170  df-xp 5644  df-iota 6464  df-fv 6519

This theorem is referenced by:  marypha2lem3  9388  marypha2lem4  9389  eulerpartlemgu  34368