Definition df-pli 5013

Description: Define addition on positive integers. This is a "temporary" set used in the construction of complex numbers df-c 5252, and is intended to be used only by the construction.

Assertion

Ref	Expression
df-pli	|- +N = ( +o |` (N. X. N.))

Detailed syntax breakdown of Definition df-pli

Step	Hyp	Ref	Expression
1		cpli 4985	. 2 class +N
2		coa 4136	. . 3 class +o
3		cnpi 4984	. . . 4 class N.
4	3, 3	cxp 3174	. . 3 class (N. X. N.)
5	2, 4	cres 3178	. 2 class ( +o |` (N. X. N.))
6	1, 5	wceq 958	1 wff +N = ( +o |` (N. X. N.))

This definition is referenced by:  addpiord 5024  dmaddpi 5030

Copyright terms: Public domain