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Every vertex of a cube is assigned a number +1 or -1 |
2013-04-01 |
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Shankar pose la question :
Every vertex of a cube is assigned a number +1 or -1 . Every face has a number that is the product of all the numbers in its corners. Then the 14 numbers are summed up ( all the vertices and faces ). Can the sum be 0?
Chris Fisher lui répond. |
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