Definition df-mi 7307

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 × N))

Detailed syntax breakdown of Definition df-mi

Step	Hyp	Ref	Expression
1		cmi 7275	. 2 class ·N
2		comu 6417	. . 3 class ·o
3		cnpi 7273	. . . 4 class N
4	3, 3	cxp 4626	. . 3 class (N × N)
5	2, 4	cres 4630	. 2 class ( ·o ↾ (N × N))
6	1, 5	wceq 1353	1 wff ·N = ( ·o ↾ (N × N))

This definition is referenced by:  mulpiord  7318  dmmulpi  7327