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Nov 10, 2014 at 21:05 history edited Aaron Meyerowitz CC BY-SA 3.0
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Nov 10, 2014 at 19:48 comment added The Masked Avenger It may be that the most convincing proof is to work backwards: find all pairs that reach the target in one step, then find all that reach the target in two steps, and so on.
Nov 10, 2014 at 18:57 comment added Pace Nielsen "For the pair (70,99) the fastest descent is..." This might be silly to ask, but why is this the fastest descent? What is the proof?
Nov 10, 2014 at 18:46 history answered Aaron Meyerowitz CC BY-SA 3.0