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Definition df-pli 6289
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.  X.  N.

Detailed syntax breakdown of Definition df-pli
StepHypRef Expression
1 cpli 6257 . 2  +N
2 coa 5937 . . 3  +o
3 cnpi 6256 . . . 4  N.
43, 3cxp 4286 . . 3  N. 
X.  N.
52, 4cres 4290 . 2  +o  |`  N.  X.  N.
61, 5wceq 1242 1  +N  +o  |`  N.  X.  N.
Colors of variables: wff set class
This definition is referenced by:  addpiord  6300  dmaddpi  6309
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