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Definition df-pli 6800
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 6768 . 2  class  +N
2 coa 6125 . . 3  class  +o
3 cnpi 6767 . . . 4  class  N.
43, 3cxp 4407 . . 3  class  ( N. 
X.  N. )
52, 4cres 4411 . 2  class  (  +o  |`  ( N.  X.  N. ) )
61, 5wceq 1287 1  wff  +N  =  (  +o  |`  ( N.  X.  N. ) )
Colors of variables: wff set class
This definition is referenced by:  addpiord  6811  dmaddpi  6820
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