Definition df-ni 6518

Description: Define the class of positive integers. This is a "temporary" set used in the construction of complex numbers df-c 6758, and is intended to be used only by the construction.

Assertion

Ref	Expression
df-ni	|- N. = (om \ {(/)})

Detailed syntax breakdown of Definition df-ni

Step	Hyp	Ref	Expression
1		cnpi 6490	. 2 class N.
2		com 4085	. . 3 class om
3		c0 3082	. . . 4 class (/)
4	3	csn 3238	. . 3 class {(/)}
5	2, 4	cdif 2824	. 2 class (om \ {(/)})
6	1, 5	wceq 1586	1 wff N. = (om \ {(/)})

This definition is referenced by:  elni 6522  pinn 6524  niex 6527  dmaddpi 6536  dmmulpi 6537

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