Theorem axcontlem1 28980

Description: Lemma for axcont 28992. Change bound variables for later use. (Contributed by Scott Fenton, 20-Jun-2013.)

Hypothesis

Ref	Expression
axcontlem1.1	⊢ 𝐹 = {⟨𝑥, 𝑡⟩ ∣ (𝑥 ∈ 𝐷 ∧ (𝑡 ∈ (0[,)+∞) ∧ ∀𝑖 ∈ (1...𝑁)(𝑥‘𝑖) = (((1 − 𝑡) · (𝑍‘𝑖)) + (𝑡 · (𝑈‘𝑖)))))}

Assertion

Ref	Expression
axcontlem1	⊢ 𝐹 = {⟨𝑦, 𝑠⟩ ∣ (𝑦 ∈ 𝐷 ∧ (𝑠 ∈ (0[,)+∞) ∧ ∀𝑗 ∈ (1...𝑁)(𝑦‘𝑗) = (((1 − 𝑠) · (𝑍‘𝑗)) + (𝑠 · (𝑈‘𝑗)))))}

Distinct variable groups:   𝐷,𝑠,𝑡,𝑥,𝑦   𝑖,𝑗,𝑠,𝑡,𝑥,𝑦,𝑁   𝑈,𝑖,𝑗,𝑠,𝑡,𝑥,𝑦   𝑖,𝑍,𝑗,𝑠,𝑡,𝑥,𝑦

Allowed substitution hints:   𝐷(𝑖,𝑗)   𝐹(𝑥,𝑦,𝑡,𝑖,𝑗,𝑠)

Proof of Theorem axcontlem1

Step	Hyp	Ref	Expression
1		axcontlem1.1	. 2 ⊢ 𝐹 = {⟨𝑥, 𝑡⟩ ∣ (𝑥 ∈ 𝐷 ∧ (𝑡 ∈ (0[,)+∞) ∧ ∀𝑖 ∈ (1...𝑁)(𝑥‘𝑖) = (((1 − 𝑡) · (𝑍‘𝑖)) + (𝑡 · (𝑈‘𝑖)))))}
2		eleq1w 2823	. . . . 5 ⊢ (𝑥 = 𝑦 → (𝑥 ∈ 𝐷 ↔ 𝑦 ∈ 𝐷))
3	2	adantr 480	. . . 4 ⊢ ((𝑥 = 𝑦 ∧ 𝑡 = 𝑠) → (𝑥 ∈ 𝐷 ↔ 𝑦 ∈ 𝐷))
4		eleq1w 2823	. . . . . 6 ⊢ (𝑡 = 𝑠 → (𝑡 ∈ (0[,)+∞) ↔ 𝑠 ∈ (0[,)+∞)))
5	4	adantl 481	. . . . 5 ⊢ ((𝑥 = 𝑦 ∧ 𝑡 = 𝑠) → (𝑡 ∈ (0[,)+∞) ↔ 𝑠 ∈ (0[,)+∞)))
6		fveq1 6904	. . . . . . . 8 ⊢ (𝑥 = 𝑦 → (𝑥‘𝑖) = (𝑦‘𝑖))
7		oveq2 7440	. . . . . . . . . 10 ⊢ (𝑡 = 𝑠 → (1 − 𝑡) = (1 − 𝑠))
8	7	oveq1d 7447	. . . . . . . . 9 ⊢ (𝑡 = 𝑠 → ((1 − 𝑡) · (𝑍‘𝑖)) = ((1 − 𝑠) · (𝑍‘𝑖)))
9		oveq1 7439	. . . . . . . . 9 ⊢ (𝑡 = 𝑠 → (𝑡 · (𝑈‘𝑖)) = (𝑠 · (𝑈‘𝑖)))
10	8, 9	oveq12d 7450	. . . . . . . 8 ⊢ (𝑡 = 𝑠 → (((1 − 𝑡) · (𝑍‘𝑖)) + (𝑡 · (𝑈‘𝑖))) = (((1 − 𝑠) · (𝑍‘𝑖)) + (𝑠 · (𝑈‘𝑖))))
11	6, 10	eqeqan12d 2750	. . . . . . 7 ⊢ ((𝑥 = 𝑦 ∧ 𝑡 = 𝑠) → ((𝑥‘𝑖) = (((1 − 𝑡) · (𝑍‘𝑖)) + (𝑡 · (𝑈‘𝑖))) ↔ (𝑦‘𝑖) = (((1 − 𝑠) · (𝑍‘𝑖)) + (𝑠 · (𝑈‘𝑖)))))
12	11	ralbidv 3177	. . . . . 6 ⊢ ((𝑥 = 𝑦 ∧ 𝑡 = 𝑠) → (∀𝑖 ∈ (1...𝑁)(𝑥‘𝑖) = (((1 − 𝑡) · (𝑍‘𝑖)) + (𝑡 · (𝑈‘𝑖))) ↔ ∀𝑖 ∈ (1...𝑁)(𝑦‘𝑖) = (((1 − 𝑠) · (𝑍‘𝑖)) + (𝑠 · (𝑈‘𝑖)))))
13		fveq2 6905	. . . . . . . 8 ⊢ (𝑖 = 𝑗 → (𝑦‘𝑖) = (𝑦‘𝑗))
14		fveq2 6905	. . . . . . . . . 10 ⊢ (𝑖 = 𝑗 → (𝑍‘𝑖) = (𝑍‘𝑗))
15	14	oveq2d 7448	. . . . . . . . 9 ⊢ (𝑖 = 𝑗 → ((1 − 𝑠) · (𝑍‘𝑖)) = ((1 − 𝑠) · (𝑍‘𝑗)))
16		fveq2 6905	. . . . . . . . . 10 ⊢ (𝑖 = 𝑗 → (𝑈‘𝑖) = (𝑈‘𝑗))
17	16	oveq2d 7448	. . . . . . . . 9 ⊢ (𝑖 = 𝑗 → (𝑠 · (𝑈‘𝑖)) = (𝑠 · (𝑈‘𝑗)))
18	15, 17	oveq12d 7450	. . . . . . . 8 ⊢ (𝑖 = 𝑗 → (((1 − 𝑠) · (𝑍‘𝑖)) + (𝑠 · (𝑈‘𝑖))) = (((1 − 𝑠) · (𝑍‘𝑗)) + (𝑠 · (𝑈‘𝑗))))
19	13, 18	eqeq12d 2752	. . . . . . 7 ⊢ (𝑖 = 𝑗 → ((𝑦‘𝑖) = (((1 − 𝑠) · (𝑍‘𝑖)) + (𝑠 · (𝑈‘𝑖))) ↔ (𝑦‘𝑗) = (((1 − 𝑠) · (𝑍‘𝑗)) + (𝑠 · (𝑈‘𝑗)))))
20	19	cbvralvw 3236	. . . . . 6 ⊢ (∀𝑖 ∈ (1...𝑁)(𝑦‘𝑖) = (((1 − 𝑠) · (𝑍‘𝑖)) + (𝑠 · (𝑈‘𝑖))) ↔ ∀𝑗 ∈ (1...𝑁)(𝑦‘𝑗) = (((1 − 𝑠) · (𝑍‘𝑗)) + (𝑠 · (𝑈‘𝑗))))
21	12, 20	bitrdi 287	. . . . 5 ⊢ ((𝑥 = 𝑦 ∧ 𝑡 = 𝑠) → (∀𝑖 ∈ (1...𝑁)(𝑥‘𝑖) = (((1 − 𝑡) · (𝑍‘𝑖)) + (𝑡 · (𝑈‘𝑖))) ↔ ∀𝑗 ∈ (1...𝑁)(𝑦‘𝑗) = (((1 − 𝑠) · (𝑍‘𝑗)) + (𝑠 · (𝑈‘𝑗)))))
22	5, 21	anbi12d 632	. . . 4 ⊢ ((𝑥 = 𝑦 ∧ 𝑡 = 𝑠) → ((𝑡 ∈ (0[,)+∞) ∧ ∀𝑖 ∈ (1...𝑁)(𝑥‘𝑖) = (((1 − 𝑡) · (𝑍‘𝑖)) + (𝑡 · (𝑈‘𝑖)))) ↔ (𝑠 ∈ (0[,)+∞) ∧ ∀𝑗 ∈ (1...𝑁)(𝑦‘𝑗) = (((1 − 𝑠) · (𝑍‘𝑗)) + (𝑠 · (𝑈‘𝑗))))))
23	3, 22	anbi12d 632	. . 3 ⊢ ((𝑥 = 𝑦 ∧ 𝑡 = 𝑠) → ((𝑥 ∈ 𝐷 ∧ (𝑡 ∈ (0[,)+∞) ∧ ∀𝑖 ∈ (1...𝑁)(𝑥‘𝑖) = (((1 − 𝑡) · (𝑍‘𝑖)) + (𝑡 · (𝑈‘𝑖))))) ↔ (𝑦 ∈ 𝐷 ∧ (𝑠 ∈ (0[,)+∞) ∧ ∀𝑗 ∈ (1...𝑁)(𝑦‘𝑗) = (((1 − 𝑠) · (𝑍‘𝑗)) + (𝑠 · (𝑈‘𝑗)))))))
24	23	cbvopabv 5215	. 2 ⊢ {⟨𝑥, 𝑡⟩ ∣ (𝑥 ∈ 𝐷 ∧ (𝑡 ∈ (0[,)+∞) ∧ ∀𝑖 ∈ (1...𝑁)(𝑥‘𝑖) = (((1 − 𝑡) · (𝑍‘𝑖)) + (𝑡 · (𝑈‘𝑖)))))} = {⟨𝑦, 𝑠⟩ ∣ (𝑦 ∈ 𝐷 ∧ (𝑠 ∈ (0[,)+∞) ∧ ∀𝑗 ∈ (1...𝑁)(𝑦‘𝑗) = (((1 − 𝑠) · (𝑍‘𝑗)) + (𝑠 · (𝑈‘𝑗)))))}
25	1, 24	eqtri 2764	1 ⊢ 𝐹 = {⟨𝑦, 𝑠⟩ ∣ (𝑦 ∈ 𝐷 ∧ (𝑠 ∈ (0[,)+∞) ∧ ∀𝑗 ∈ (1...𝑁)(𝑦‘𝑗) = (((1 − 𝑠) · (𝑍‘𝑗)) + (𝑠 · (𝑈‘𝑗)))))}

Syntax hints:   ↔ wb 206   ∧ wa 395   = wceq 1539   ∈ wcel 2107  ∀wral 3060  {copab 5204  ‘cfv 6560  (class class class)co 7432  0cc0 11156  1c1 11157   + caddc 11159   · cmul 11161  +∞cpnf 11293   − cmin 11493  [,)cico 13390  ...cfz 13548

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-ext 2707

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-sb 2064  df-clab 2714  df-cleq 2728  df-clel 2815  df-ral 3061  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-iota 6513  df-fv 6568  df-ov 7435

This theorem is referenced by:  axcontlem6  28985  axcontlem11  28990