Definition df-mi 7247

Description: Define multiplication 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-mi	|- .N = ( .o |` ( N. X. N. ) )

Detailed syntax breakdown of Definition df-mi

Step	Hyp	Ref	Expression
1		cmi 7215	. 2 class .N
2		comu 6382	. . 3 class .o
3		cnpi 7213	. . . 4 class N.
4	3, 3	cxp 4602	. . 3 class ( N. X. N. )
5	2, 4	cres 4606	. 2 class ( .o |` ( N. X. N. ) )
6	1, 5	wceq 1343	1 wff .N = ( .o |` ( N. X. N. ) )

This definition is referenced by:  mulpiord  7258  dmmulpi  7267