Definition df-1r 7919

Description: Define signed real constant 1. 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-1r	|- 1R = [ <. ( 1P +P. 1P ) , 1P >. ] ~R

Detailed syntax breakdown of Definition df-1r

Step	Hyp	Ref	Expression
1		c1r 7486	. 2 class 1R
2		c1p 7479	. . . . 5 class 1P
3		cpp 7480	. . . . 5 class +P.
4	2, 2, 3	co 6001	. . . 4 class ( 1P +P. 1P )
5	4, 2	cop 3669	. . 3 class <. ( 1P +P. 1P ) , 1P >.
6		cer 7483	. . 3 class ~R
7	5, 6	cec 6678	. 2 class [ <. ( 1P +P. 1P ) , 1P >. ] ~R
8	1, 7	wceq 1395	1 wff 1R = [ <. ( 1P +P. 1P ) , 1P >. ] ~R

This definition is referenced by:  1sr  7938  m1p1sr  7947  m1m1sr  7948  0lt1sr  7952  1idsr  7955  recexgt0sr  7960  caucvgsrlembound  7981  caucvgsr  7989  pitonnlem1  8032  pitonnlem2  8034  recidpirq  8045  nntopi  8081