Hosted by The Math Forum## Problem of the Week 1129## Sources on a Cube
Find an orientation of each edge of a cube so that for each vertex, the out-degree is either one or three. Extra credit: Orient edges of the 5-cube so that each vertex has out-degree one or five. Source: MSRI Spring/Summer Emissary Newsletter. © Copyright 2010 Stan Wagon. Reproduced with permission. |

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13 September 2010