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Definition df-pli 9240
Description: Define addition on positive integers. This is a "temporary" set used in the construction of complex numbers df-c 9487, 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.  X.  N. ) )

Detailed syntax breakdown of Definition df-pli
StepHypRef Expression
1 cpli 9212 . 2  class  +N
2 coa 7119 . . 3  class  +o
3 cnpi 9211 . . . 4  class  N.
43, 3cxp 4986 . . 3  class  ( N. 
X.  N. )
52, 4cres 4990 . 2  class  (  +o  |`  ( N.  X.  N. ) )
61, 5wceq 1398 1  wff  +N  =  (  +o  |`  ( N.  X.  N. ) )
Colors of variables: wff setvar class
This definition is referenced by:  addpiord  9251  dmaddpi  9257
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