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Plangers
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Bryant, V. W. – Mathematical Spectrum, 1972
Problems involving the use of diagrams to depict plangers'' (in which lines cross a specified number of times) are discussed. (LS)
Descriptors: Mathematical Applications, Mathematical Enrichment, Mathematical Models, Mathematics
Sums of Sets of Integers
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Niven, Ivan – Mathematical Spectrum, 1969
Descriptors: College Mathematics, Integers, Mathematical Concepts, Mathematical Enrichment
A Problem on Convex Quadrilaterals
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Watson, F. R. – Mathematical Spectrum, 1969
Descriptors: Discovery Processes, Geometric Concepts, Induction, Mathematical Enrichment
The Promotion Problem
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Bartholomew, D. J. – Mathematical Spectrum, 1969
Descriptors: Algebra, College Mathematics, Mathematical Enrichment, Mathematical Models
Plane and Coloured
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Vajda, S. – Mathematical Spectrum, 1969
Discussed are some applications of Euler's Formula N plus F minus E equals Z, where N, F, and E are respectively the number of vertices, faces, and edges of a planar figure. In particular, the Four-Color Problem is proved for the special case of five countries. (CT)
Descriptors: Geometric Concepts, Mathematical Concepts, Mathematical Enrichment, Mathematics
A Probabilistic Triangle Problem
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Rade, L. – Mathematical Spectrum, 1969
Descriptors: Geometric Concepts, Geometry, Mathematical Concepts, Mathematical Enrichment