At: hanoi sol2 analemma
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THEN SimilarTo Thm* p,q:Peg. Thm* p q Thm* Thm* (a:, z:{a...}, f:({a...z}Peg). Thm* (f(a) = p & f(z) = q Thm* ( Thm* ((x:{a...z-1}, y:{x+1...z}. Thm* (((u:{a...x}. f(u) = p) Thm* ((& f(x+1) p Thm* ((& f(y-1) q Thm* ((& (u:{y...z}. f(u) = q))) |
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2. p : Peg 3. q : Peg 4. p q 5. a : 6. z : {a...} 7. f:({a...z}Peg). 7. f(a) = p & f(z) = q 7. 7. (x:{a...z-1}, y:{x+1...z}. 7. ((u:{a...x}. f(u) = p) & f(x+1) p & f(y-1) q & (u:{y...z}. f(u) = q)) 8. s : {a...z}{1...n}Peg 9. s is a Hanoi(n disk) seq on a..z 10. s(a) = (i.p) 11. s(z) = (i.q) x:{a...z-1}, y:{x+1...z}, p',q':Peg. (u:{a...x}. s(u,n) = p) & (u:{y...z}. s(u,n) = q) & s(x) = (i.p') {1...n-1}Peg & s(y) = (i.q') {1...n-1}Peg & p p' & q q' | 23 steps |
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