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Definition df-pli 7077
Description: Define addition on positive integers. This is a "temporary" set used in the construction of complex numbers, and is intended to be used only by the construction. (Contributed by NM, 26-Aug-1995.)
Assertion
Ref Expression
df-pli +N = ( +o ↾ (N × N))

Detailed syntax breakdown of Definition df-pli
StepHypRef Expression
1 cpli 7045 . 2 class +N
2 coa 6276 . . 3 class +o
3 cnpi 7044 . . . 4 class N
43, 3cxp 4505 . . 3 class (N × N)
52, 4cres 4509 . 2 class ( +o ↾ (N × N))
61, 5wceq 1314 1 wff +N = ( +o ↾ (N × N))
Colors of variables: wff set class
This definition is referenced by:  addpiord  7088  dmaddpi  7097
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