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Definition df-pli 6151
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 6119 . 2 class +N
2 coa 5901 . . 3 class +𝑜
3 cnpi 6118 . . . 4 class N
43, 3cxp 4258 . . 3 class (N × N)
52, 4cres 4262 . 2 class ( +𝑜 ↾ (N × N))
61, 5wceq 1223 1 wff +N = ( +𝑜 ↾ (N × N))
Colors of variables: wff set class
This definition is referenced by:  addpiord  6162  dmaddpi  6171
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