| Some definitions of interest. |
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hanoi_seq | Def s is a Hanoi(n disk) seq on a..z
Def == x,x':{a...z}.
Def == x+1 = x' (k:{1...n}. Moving disk k of n takes s(x) to s(x')) |
| | Thm* n:, a,z:, s:({a...z}{1...n}Peg).
Thm* s is a Hanoi(n disk) seq on a..z Prop |
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hanoi_PEG | Def Peg == {1...3} |
| | Thm* Peg Type |
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hanoi_otherpeg | Def otherPeg(x; y) == 6-(x+y) |
| | Thm* x,y:Peg. x y otherPeg(x; y) Peg |
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hanoi_seq_join | Def (s1 @(m) s2)(x) == if xm s1(x) else s2(x) fi |
| | Thm* n:, m,a,z:, s1:({a...m}{1...n}Peg), s2:({m+1...z}{1...n}Peg).
Thm* (s1 @(m) s2) {a...z}{1...n}Peg |
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int_iseg | Def {i...j} == {k:| ik & kj } |
| | Thm* i,j:. {i...j} Type |
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int_upper | Def {i...} == {j:| ij } |
| | Thm* n:. {n...} Type |
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member_and | Def x A, P == x A & P |
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nat_plus | Def == {i:| 0<i } |
| | Thm* Type |
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nequal | Def a b T == a = b T |
| | Thm* A:Type, x,y:A. (x y) Prop |