Saturday, 18 February 2023

The Five Great Games of patience: Live!

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The Five Great Games of patience are now live at  p5g.racingdemon.net ! What are the Five Great Games of patience? The games are Aunty Allis...
Sunday, 15 January 2023

Happy 2023!

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Monthly visitors 2021-22. Page views ~3 each. My main interests in the past year have not been maths and relativity  and I have not posted h...
Monday, 10 January 2022

New Scientist Christmas Puzzle 2021

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  The grid contains 46 x 72 = 3,312 letters. Hidden inside it are the 118 elements in the periodic table, 17 known fundamental particles and...
1 comment:
Tuesday, 7 December 2021

Powers of sine and cosine as multiple angles

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I had a problem which required integrating powers of sines and cosines.  I used integral-calculator to do the work up to a power of six. It...
Monday, 22 November 2021

3D-grapher at math3d.org

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I was practicing my tensor analysis and calculated a normal vector to a surface. I wanted to see it looked orthogonal to the surface. It did...
1 comment:
Monday, 25 October 2021

Cubic equations and elliptic curves

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At what ##c## does the curve change from one type to the other and what then is the leftmost point of the curve? Answers$$c=\sqrt{\frac{32}{...
Tuesday, 12 October 2021

The Parallel Propagator and using it on the surface of a sphere

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The three page Appendix I is on the parallel propagator which gives a general solution to the parallel transport equation of a vector. The a...