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Definition df-plq 9696
Description: Define addition on positive fractions. This is a "temporary" set used in the construction of complex numbers df-c 9902, 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
StepHypRef Expression
1 cplq 9637 . 2 class +Q
2 cerq 9636 . . . 4 class [Q]
3 cplpq 9630 . . . 4 class +pQ
42, 3ccom 5088 . . 3 class ([Q] ∘ +pQ )
5 cnq 9634 . . . 4 class Q
65, 5cxp 5082 . . 3 class (Q × Q)
74, 6cres 5086 . 2 class (([Q] ∘ +pQ ) ↾ (Q × Q))
81, 7wceq 1480 1 wff +Q = (([Q] ∘ +pQ ) ↾ (Q × Q))
Colors of variables: wff setvar class
This definition is referenced by:  addpqnq  9720  addnqf  9730
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