Definition df-0r 7798

Description: Define signed real constant 0. This is a "temporary" set used in the construction of complex numbers, and is intended to be used only by the construction. From Proposition 9-4.2 of [Gleason] p. 126. (Contributed by NM, 9-Aug-1995.)

Assertion

Ref	Expression
df-0r	|- 0R = [ <. 1P , 1P >. ] ~R

Detailed syntax breakdown of Definition df-0r

Step	Hyp	Ref	Expression
1		c0r 7365	. 2 class 0R
2		c1p 7359	. . . 4 class 1P
3	2, 2	cop 3625	. . 3 class <. 1P , 1P >.
4		cer 7363	. . 3 class ~R
5	3, 4	cec 6590	. 2 class [ <. 1P , 1P >. ] ~R
6	1, 5	wceq 1364	1 wff 0R = [ <. 1P , 1P >. ] ~R

This definition is referenced by:  gt0srpr  7815  0r  7817  m1p1sr  7827  0lt1sr  7832  0idsr  7834  00sr  7836  suplocsrlempr  7874  pitoregt0  7916