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Various Systems of Notation
Some Facts from the Theory of Numbers
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ABCD angle base cards centre chess coins colour column congruence construct contains continued fraction coordinates corresponding curve diagonal digits distributed divided divisible dodecahedron domino easy to verify elements empty square equals equation equi-composed example figure follows formula four given hexagon horizontal icosahedron identical inequality integers KLMN knight Kolya letters Lissajous curves m-sided magic squares method Napier's rods natural number nodal points node number N number of moves objects obtain octahedron odd permutation parallel parallelepiped parquets paths permutation pieces pile places plane player polygon possible prismatoid problem prove Pythagorean triples rectangle regions regular pentagon regular polygons relatively prime remaining rhombi rhombic dodecahedron ring rook roubles sector side situated smallest solution special position straight line subdivided symmetrical system of notation tetrahedron Theorem total number transpositions underneath values various vertex vertices