Definition df-ico 10129

Description: Define the set of closed-below, open-above intervals of extended reals. (Contributed by NM, 24-Dec-2006.)

Assertion

Ref	Expression
df-ico	⊢ [,) = (𝑥 ∈ ℝ*, 𝑦 ∈ ℝ* ↦ {𝑧 ∈ ℝ* ∣ (𝑥 ≤ 𝑧 ∧ 𝑧 < 𝑦)})

Distinct variable group:   𝑥,𝑦,𝑧

Detailed syntax breakdown of Definition df-ico

Step	Hyp	Ref	Expression
1		cico 10125	. 2 class [,)
2		vx	. . 3 setvar 𝑥
3		vy	. . 3 setvar 𝑦
4		cxr 8213	. . 3 class ℝ*
5	2	cv 1396	. . . . . 6 class 𝑥
6		vz	. . . . . . 7 setvar 𝑧
7	6	cv 1396	. . . . . 6 class 𝑧
8		cle 8215	. . . . . 6 class ≤
9	5, 7, 8	wbr 4088	. . . . 5 wff 𝑥 ≤ 𝑧
10	3	cv 1396	. . . . . 6 class 𝑦
11		clt 8214	. . . . . 6 class <
12	7, 10, 11	wbr 4088	. . . . 5 wff 𝑧 < 𝑦
13	9, 12	wa 104	. . . 4 wff (𝑥 ≤ 𝑧 ∧ 𝑧 < 𝑦)
14	13, 6, 4	crab 2514	. . 3 class {𝑧 ∈ ℝ* ∣ (𝑥 ≤ 𝑧 ∧ 𝑧 < 𝑦)}
15	2, 3, 4, 4, 14	cmpo 6020	. 2 class (𝑥 ∈ ℝ*, 𝑦 ∈ ℝ* ↦ {𝑧 ∈ ℝ* ∣ (𝑥 ≤ 𝑧 ∧ 𝑧 < 𝑦)})
16	1, 15	wceq 1397	1 wff [,) = (𝑥 ∈ ℝ*, 𝑦 ∈ ℝ* ↦ {𝑧 ∈ ℝ* ∣ (𝑥 ≤ 𝑧 ∧ 𝑧 < 𝑦)})

This definition is referenced by:  icoval  10154  elico1  10158  icossico  10178  iccssico  10180  iccssico2  10182  icossxr  10193  icossicc  10195  ioossico  10197  icossioo  10199  elicore  10527