Definition df-rp 9950

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	|- RR+ = { x e. RR | 0 < x }

Detailed syntax breakdown of Definition df-rp

Step	Hyp	Ref	Expression
1		crp 9949	. 2 class RR+
2		cc0 8092	. . . 4 class 0
3		vx	. . . . 5 setvar x
4	3	cv 1397	. . . 4 class x
5		clt 8273	. . . 4 class <
6	2, 4, 5	wbr 4093	. . 3 wff 0 < x
7		cr 8091	. . 3 class RR
8	6, 3, 7	crab 2515	. 2 class { x e. RR | 0 < x }
9	1, 8	wceq 1398	1 wff RR+ = { x e. RR | 0 < x }

This definition is referenced by:  elrp  9951  rpre  9956  ioorp  10247