What is this Operation?


12/2/05

Describe what the operation * is doing exactly. Because A*B=B*A, only half of the table is shown.

*
0
1
2
3
4
5
6
7
8
9
0
0
0
8
8
8
8
8
0
8
8
1
 
1
u
3
4
9
8
7
8
9
2
 
 
2
u
8
8
8
u
8
8
3
 
 
 
3
9
9
8
3
8
9
4
 
 
 
 
4
9
8
u
8
9
5
 
 
 
 
 
5
6
9
8
9
6
 
 
 
 
 
 
6
8
8
8
7
 
 
 
 
 
 
 
7
8
9
8
 
 
 
 
 
 
 
 
8
8
9
 
 
 
 
 
 
 
 
 
9
(u means undefined)

Hint: think of a digital clock

Answer: As of 6/20/09 no one has the answer, so I'll spill the beans. Take a standard digital clock, and cross your eyes until number A overlaps number B. The number A*B is what the overlap of A and B produces.


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