| 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 x m 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: | i k & k j } |
| | Thm* i,j: . {i...j} Type |
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int_upper | Def {i...} == {j: | i j } |
| | Thm* n: . {n...} Type |
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not | Def A == A  False |
| | Thm* A:Prop. ( A) Prop |