Posted in Beautiful math, Curiosity, geometry, Problem solving, Simple math by: admin

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26 May

TweetPaul Brown, an Australian math teacher and author of Proof, a book that I may characterize as a well-written guided introduction into that most fundamental activity, has brought to my attention a recent post at the Futility Closet blog, The Jeweler’s Observation, which I fully reproduce below: Prove that every convex polyhedron has at least […]

Posted in Curiosity, Life lessons, Photos, physics, Uncategorized by: admin

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24 Apr

This is to simply document my observation which I've been mulling over for a long time until very recently.

A couple of streets that I daily drive over are lined with trees whose branches seem to exhibit strange growth pattern. While their older branches point unremarkably each other way, the younger ones sprout pretty much vertically

Posted in Books to read, Curiosity, Math in literature, Uncategorized by: admin

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29 Jan

Truth be told, at the outset, when I realized what the book was about, I was a little annoyed. Science is science and fantasy is fantasy, and one may not want to know that there might be something wrong with the concepts in the book one is enjoying. Should everything be laid bare? That's literature we are talking about, for crying out loud, not textbooks or manuals! But Adler's writing is lucid and engaging and it sucks you in. There are so many whys and whats that I eventually developed a feeling that reality may be by far more interesting then any kind of fiction.

Posted in Algebra, Curiosity by: admin

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19 Sep

While the cube root of 2+sqrt(5) is in the extension field Q[sqrt(5)], the square root of 2+sqrt(3) is not in Q[sqrt(3)] but rather in Q[sqrt(2), sqrt(3)]

Posted in Curiosity, geometry by: admin

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21 May

It is then meaningful to ask whether a line could be simultaneously an area and a perimeter splitter, and seek a characterization of such lines if they exist. As a matter of fact, they do, and there may be 1, 2, or 3such lines. This was shown by A. Todd a senior at university. In truth, the problem has an interesting history.

Posted in Curiosity, Photos, physics by: admin

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15 May

When shooting in proximity to a puddle, the reflection of an object comes out sharp is the focus taken is as if you were shooting the object itself. This becomes quite clear when you compare the two pictures below. In the first one focus is on the reflection, in the second it's on the surface of the puddle.

Posted in Calculus, Curiosity, geometry by: admin

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03 Feb

TweetAssume you work with the kids who do not yet know the famous formula for the area of a circle of radius . How would you explain to the kids that the area of the circle quadruples when the radius doubles? This is the question raised by Linda Fahlberg-Stojanovska at the mathfuture google group. For […]

Posted in Algorithms, Curiosity, For the whole family, Games, Homeschooling by: admin

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19 Sep

I believe that the discrete variant makes the solution more transparent. For example, think of coffee and cream not as liquids but as collections of molecules. Since the number of molecules in the two glasses remains the same even after repeated iterations, cream molecules in the "water" glass come at the expenses of the water molecules in the "cream" glass and, therefore, the two quantities are equal.

Posted in Books to read, Curiosity by: admin

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22 Jul

Who is it that fills the space? The space itself, of course - whatever that space is. ... Only a 0-dimensional space - "the Abyss of No dimensions," in the words of Abbott - has enough room for a single individual. It's this fellow who fills its space in *Flatland* and keeps broadcasting the news

Posted in Curiosity, Puzzles, Simple math by: admin

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12 Jul

I posed the problem to my (future) 9th grader son whose math teacher I am not happy with. It seems to me that what he does is mostly memorizing formulas and putting in numbers to get numeric results. But the boy proved to still have his wits about him. Without batting an eyelid he gave his answer: "It's simple. It is faster to start moving right away. There is no advantage in losing any time at the outset."