At: hanoi general exists lemma1
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2. f : {1...n}Peg 3. g : {1...n}Peg 4. f(n) = g(n) 5. a : 6. z : {a...} 7. s:({a...z}{1...n-1}Peg). 7. s is a Hanoi(n-1 disk) seq on a..z 7. & s(a) = f {1...n-1}Peg 7. & s(z) = g {1...n-1}Peg s:({a...z}{1...n}Peg). s is a Hanoi(n disk) seq on a..z & s(a) = f & s(z) = g | 15 steps |
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