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Betty wrote, “I know that the word part –post - means after. How does that tie into the word postulate, a self-evident assumption or axiom that is used in geometry?” There is no connection. With surprising frequency, word parts with no connection to each other accidentally wind up with identical spelling, the very same letter sequence, even though the meaning and the source are miles apart.
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Einstein’s derivation of E=mc^2 revisited

Academics / Mathematics : Terence Tao's Blog (2 years ago)

Way back in 2007, I wrote a blog post giving Einstein’s derivation of his famous equation. This derivation used a number of physical assumptions, including the following: The two postulates of special relativity: firstly, that the l... Read Post

Sketchy lexicography

Academics / Linguistics : Language Log (4 years ago)

JS writes: I don't think I used the word "sketchy" till I came to college in Virginia, but now I use it with such frequency (especially whenever a party, a city or nightlife is involved) that I am surprised that the meaning I use mo... Read Post

Study for Geometry Class with the Geometry Stash iPhone App

Academics : Edu in Review Blog (4 years ago)

Are you taking or teaching a geometry class? Then you’ll want to check out the Geometry Stash iPhone App created by Anson Liu, a useful quick-reference tool for iPhone. The app is a dictionary of geometry postulates and theorems, an... Read Post


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