Definition df-rp 9581

Description: Define the set of positive reals. Definition of positive numbers in [Apostol] p. 20. (Contributed by NM, 27-Oct-2007.)

Assertion

Ref	Expression
df-rp	⊢ ℝ+ = {𝑥 ∈ ℝ ∣ 0 < 𝑥}

Detailed syntax breakdown of Definition df-rp

Step	Hyp	Ref	Expression
1		crp 9580	. 2 class ℝ+
2		cc0 7744	. . . 4 class 0
3		vx	. . . . 5 setvar 𝑥
4	3	cv 1341	. . . 4 class 𝑥
5		clt 7924	. . . 4 class <
6	2, 4, 5	wbr 3976	. . 3 wff 0 < 𝑥
7		cr 7743	. . 3 class ℝ
8	6, 3, 7	crab 2446	. 2 class {𝑥 ∈ ℝ ∣ 0 < 𝑥}
9	1, 8	wceq 1342	1 wff ℝ+ = {𝑥 ∈ ℝ ∣ 0 < 𝑥}

This definition is referenced by:  elrp  9582  rpre  9587  ioorp  9878