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Definition df-pli 9655
Description: Define addition on positive integers. 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. (Contributed by NM, 26-Aug-1995.) (New usage is discouraged.)
Assertion
Ref Expression
df-pli +N = ( +𝑜 ↾ (N × N))

Detailed syntax breakdown of Definition df-pli
StepHypRef Expression
1 cpli 9627 . 2 class +N
2 coa 7517 . . 3 class +𝑜
3 cnpi 9626 . . . 4 class N
43, 3cxp 5082 . . 3 class (N × N)
52, 4cres 5086 . 2 class ( +𝑜 ↾ (N × N))
61, 5wceq 1480 1 wff +N = ( +𝑜 ↾ (N × N))
Colors of variables: wff setvar class
This definition is referenced by:  addpiord  9666  dmaddpi  9672
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