Theorem marypha2lem2 9427

Description: Lemma for marypha2 9430. 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 4637	. . . 4 ⊢ (𝑥 = 𝑧 → {𝑥} = {𝑧})
3		fveq2 6888	. . . 4 ⊢ (𝑥 = 𝑧 → (𝐹‘𝑥) = (𝐹‘𝑧))
4	2, 3	xpeq12d 5706	. . 3 ⊢ (𝑥 = 𝑧 → ({𝑥} × (𝐹‘𝑥)) = ({𝑧} × (𝐹‘𝑧)))
5	4	cbviunv 5042	. 2 ⊢ ∪ 𝑥 ∈ 𝐴 ({𝑥} × (𝐹‘𝑥)) = ∪ 𝑧 ∈ 𝐴 ({𝑧} × (𝐹‘𝑧))
6		df-xp 5681	. . . . 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 5017	. . 3 ⊢ ∪ 𝑧 ∈ 𝐴 ({𝑧} × (𝐹‘𝑧)) = ∪ 𝑧 ∈ 𝐴 {⟨𝑥, 𝑦⟩ ∣ (𝑥 ∈ {𝑧} ∧ 𝑦 ∈ (𝐹‘𝑧))}
9		iunopab 5558	. . 3 ⊢ ∪ 𝑧 ∈ 𝐴 {⟨𝑥, 𝑦⟩ ∣ (𝑥 ∈ {𝑧} ∧ 𝑦 ∈ (𝐹‘𝑧))} = {⟨𝑥, 𝑦⟩ ∣ ∃𝑧 ∈ 𝐴 (𝑥 ∈ {𝑧} ∧ 𝑦 ∈ (𝐹‘𝑧))}
10		velsn 4643	. . . . . . . 8 ⊢ (𝑥 ∈ {𝑧} ↔ 𝑥 = 𝑧)
11		equcom 2021	. . . . . . . 8 ⊢ (𝑥 = 𝑧 ↔ 𝑧 = 𝑥)
12	10, 11	bitri 274	. . . . . . 7 ⊢ (𝑥 ∈ {𝑧} ↔ 𝑧 = 𝑥)
13	12	anbi1i 624	. . . . . 6 ⊢ ((𝑥 ∈ {𝑧} ∧ 𝑦 ∈ (𝐹‘𝑧)) ↔ (𝑧 = 𝑥 ∧ 𝑦 ∈ (𝐹‘𝑧)))
14	13	rexbii 3094	. . . . 5 ⊢ (∃𝑧 ∈ 𝐴 (𝑥 ∈ {𝑧} ∧ 𝑦 ∈ (𝐹‘𝑧)) ↔ ∃𝑧 ∈ 𝐴 (𝑧 = 𝑥 ∧ 𝑦 ∈ (𝐹‘𝑧)))
15		fveq2 6888	. . . . . . 7 ⊢ (𝑧 = 𝑥 → (𝐹‘𝑧) = (𝐹‘𝑥))
16	15	eleq2d 2819	. . . . . 6 ⊢ (𝑧 = 𝑥 → (𝑦 ∈ (𝐹‘𝑧) ↔ 𝑦 ∈ (𝐹‘𝑥)))
17	16	ceqsrexbv 3643	. . . . 5 ⊢ (∃𝑧 ∈ 𝐴 (𝑧 = 𝑥 ∧ 𝑦 ∈ (𝐹‘𝑧)) ↔ (𝑥 ∈ 𝐴 ∧ 𝑦 ∈ (𝐹‘𝑥)))
18	14, 17	bitri 274	. . . 4 ⊢ (∃𝑧 ∈ 𝐴 (𝑥 ∈ {𝑧} ∧ 𝑦 ∈ (𝐹‘𝑧)) ↔ (𝑥 ∈ 𝐴 ∧ 𝑦 ∈ (𝐹‘𝑥)))
19	18	opabbii 5214	. . 3 ⊢ {⟨𝑥, 𝑦⟩ ∣ ∃𝑧 ∈ 𝐴 (𝑥 ∈ {𝑧} ∧ 𝑦 ∈ (𝐹‘𝑧))} = {⟨𝑥, 𝑦⟩ ∣ (𝑥 ∈ 𝐴 ∧ 𝑦 ∈ (𝐹‘𝑥))}
20	8, 9, 19	3eqtri 2764	. 2 ⊢ ∪ 𝑧 ∈ 𝐴 ({𝑧} × (𝐹‘𝑧)) = {⟨𝑥, 𝑦⟩ ∣ (𝑥 ∈ 𝐴 ∧ 𝑦 ∈ (𝐹‘𝑥))}
21	1, 5, 20	3eqtri 2764	1 ⊢ 𝑇 = {⟨𝑥, 𝑦⟩ ∣ (𝑥 ∈ 𝐴 ∧ 𝑦 ∈ (𝐹‘𝑥))}

Syntax hints:   ∧ wa 396   = wceq 1541   ∈ wcel 2106  ∃wrex 3070  {csn 4627  ∪ ciun 4996  {copab 5209   × cxp 5673  ‘cfv 6540

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 1913  ax-6 1971  ax-7 2011  ax-8 2108  ax-9 2116  ax-11 2154  ax-12 2171  ax-ext 2703

This theorem depends on definitions:  df-bi 206  df-an 397  df-or 846  df-3an 1089  df-tru 1544  df-fal 1554  df-ex 1782  df-nf 1786  df-sb 2068  df-clab 2710  df-cleq 2724  df-clel 2810  df-nfc 2885  df-ral 3062  df-rex 3071  df-rab 3433  df-v 3476  df-dif 3950  df-un 3952  df-in 3954  df-ss 3964  df-nul 4322  df-if 4528  df-sn 4628  df-pr 4630  df-op 4634  df-uni 4908  df-iun 4998  df-br 5148  df-opab 5210  df-xp 5681  df-iota 6492  df-fv 6548

This theorem is referenced by:  marypha2lem3  9428  marypha2lem4  9429  eulerpartlemgu  33364