Definition df-plq 10670

Description: Define addition on positive fractions. This is a "temporary" set used in the construction of complex numbers df-c 10877, and is intended to be used only by the construction. From Proposition 9-2.3 of [Gleason] p. 117. (Contributed by NM, 24-Aug-1995.) (New usage is discouraged.)

Assertion

Ref	Expression
df-plq	⊢ +Q = (([Q] ∘ +pQ ) ↾ (Q × Q))

Detailed syntax breakdown of Definition df-plq

Step	Hyp	Ref	Expression
1		cplq 10611	. 2 class +Q
2		cerq 10610	. . . 4 class [Q]
3		cplpq 10604	. . . 4 class +pQ
4	2, 3	ccom 5593	. . 3 class ([Q] ∘ +pQ )
5		cnq 10608	. . . 4 class Q
6	5, 5	cxp 5587	. . 3 class (Q × Q)
7	4, 6	cres 5591	. 2 class (([Q] ∘ +pQ ) ↾ (Q × Q))
8	1, 7	wceq 1539	1 wff +Q = (([Q] ∘ +pQ ) ↾ (Q × Q))

This definition is referenced by:  addpqnq  10694  addnqf  10704