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Definition df-mi 6812
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
StepHypRef Expression
1 cmi 6780 . 2 class ·N
2 comu 6135 . . 3 class ·𝑜
3 cnpi 6778 . . . 4 class N
43, 3cxp 4411 . . 3 class (N × N)
52, 4cres 4415 . 2 class ( ·𝑜 ↾ (N × N))
61, 5wceq 1287 1 wff ·N = ( ·𝑜 ↾ (N × N))
Colors of variables: wff set class
This definition is referenced by:  mulpiord  6823  dmmulpi  6832
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