Continuing about Pythagorean triples, the tutor considers the isosceles case. In my previous post I discussed all-integer solutions to the Pythagoras equation a^2 + b^2 =c^2 Such solutions are often called Pythagorean triples. Presently we consider the possibility of Pythagorean …

Math: Are there (integer) Pythagorean triples with two equal sides? Read more »

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The tutor comments on a New Year’s resolution that surprises him. Since before New Year’s, I’ve been asking people what their New Year’s resolution might be. Hardly anyone committed to one; what I remember is being told “I don’t make …

Lifestyle: New Year’s resolutions: getting organized? Read more »

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The tutor gives an example of a confidence interval. Example 1: Let’s imagine a part has mean lifetime thirty-six months, with standard deviation ten months. What minimum time will it last, with 95% confidence? Solution: Let’s use μ for mean, …

Statistics: a one-sided confidence interval Read more »

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The tutor brings up another great find from the Windows Start menu. I’ve rediscovered the Windows 7 calculator. It can be opened by typing calc.exe into the search box (Start Menu), or else at the Command Prompt. It’s also available …

Windows 7: accessories: the calculator: standard deviation Read more »

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The tutor tells a useful hint he learned from unix.com. Sometimes, searching a directory in Linux, the results are so numerous that the user is plunged to the end, not being able to see the early or middle entries. There …

Linux: display ls results one page at a time Read more »

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