Crossed lines in the brick factory

Article Abstract:

The problem of the crossing number remains unsolved despite efforts from mathematicians. The concept was first identified by Hungarian mathematician Paul Turan in 1944 while working in a brick factory. It involves determining the minimum number of times that two edges cross each other for different types of graphs.

Mathematical recreations, Graph theory

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Crystallography of a golf ball

Article Abstract:

The arrangement of dimples on a golf ball that governs its flight can also be viewed in terms of its mathematical significance.For example, the symmetry of a golf ball can be deduced by identifying its parting line and number of dimples. A ball with 336 dimples and 3 parting lines forms an octahedral symmetry.

Golf balls

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Empires on the moon

Article Abstract:

The Earth-moon problem requires considerable mathematical dexterity to be solved. In the problem, the Earth is treated into distinct regions, each of which is annexed to the moon. The maze calls for a color arrangement such that no two adjacent regions will have the same color.

Earth

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