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Monthly Archives: November 2011
What not to (cough) do during the opera
Went to the opera Saturday night. It was great, my companions informed me. I have to take their word for it because for me much of it was drowned out by the constant coughing of a woman in the row … Continue reading
Five Regular Solids, Part Three
Parts One and Two of this series of blogs established the following facts about solids that have F flat faces, E straight edges and V vertices. 1. The second fact concerns those solids that are regular. By regular we mean … Continue reading
Posted in Geometry, Mathematics and Logic
Tagged cube, dodecahedron, icosahedron, mathematics, octahedron, polyhedra, regular solids, tetrahedron
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Five Regular Solids, Part Two
We have counted the number of faces (F), the number of vertices (V) and the number of edges (E) on five regular solids. These solids are regular because the number of edges bounding each face (m) is the same for … Continue reading
Posted in Geometry, Mathematics and Logic
Tagged cube, dodecahedron, icosahedron, mathematics, octahedron, polyhedra, regular solids, tetrahedron
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Fasterthanlight neutrinos update
Two months ago, I commented on the report by physicists at Gran Sasso National Laboratory in Italy who claimed they had observed neutrinos travelling faster than light. I pointed out that in real science (as opposed to crank science) anomalous … Continue reading
Posted in Crank science, Skepticism
Tagged crank science, faster than light, physics, relativity
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Five Regular Solids, Part One
Observe the five colourful objects that head my blog. The tetrahedron Leftmost is a tetrahedron — a pyramid with a triangular base. Notice how regular and symmetric it is. It has four corners — mathematicians call them vertices (singular vertex) … Continue reading
Posted in Uncategorized
Tagged cube, dodecahedron, icosahedron, octahedron, polyhedra, regular solids, tetrahedron
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Film Review: Anonymous
Hamlet is about Hamlet’s resentment of his uncle; Othello is about Othello’s possessiveness of Desdemona ; Twelfth Night is about Viola’s love of Orsino. You would think, therefore, that Roland Emmerich’s new film Anonymous, which promotes the theory that the … Continue reading
The Mirror Puzzle
Most people laugh when I ask this question. Then they tieĀ themselves into knots trying to answer it. Explanations are usually accompanied by diagrams featuring stick figures. Actually you can answer it in less than 50 words, without diagrams. Here’s … Continue reading
All trig functions in one figure
Here’s a pretty thing that got completely missed in my grammar school mathematics class. We build a geometric diagram in which each trigonometric function corresponds to the length of a line. Remember the trigonometric functions? You’ll need them to appreciate … Continue reading
Posted in Geometry, Mathematics and Logic
Tagged Geometry, trigonometry, unit circle
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