Tag Archives: Math

A Formula for the nth Prime

As some of you know, I was trained as a mathematician. I’ve always been a bit of a math nerd and read about mathematics even as a child. Long ago, probably when I was still in elementary school, I read … Continue reading

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Innumeracy and the Press

It’s no secret that Irreal doesn’t hold the press in very high regard. There are, of course, exceptions but too many journalists are ignorant and lazy. That seems overwrought but consider this example: Mekita Rivas, a journalist who writes for … Continue reading

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Today is a Palindrome

Today’s date, 02022020, is a palindrome. Palindromic dates happen all the time but today is special. So special that it’s unique. First of all, today is a palindromic date everywhere. Because of the silly date format that either the U.S. … Continue reading

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Little Improvements Add Up

All Irreal readers, I’m sure, are familiar with the power of compounding if only because they know about “compound interest.” Every now and then, Paul Graham (re)tweets an interesting mathematical fact. The last example I wrote about is the fact … Continue reading

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Any Well Shuffled Card Deck Is Almost Certainly Unique

From Paul Graham we have this interesting fact: Any time you pick up a well shuffled deck, you are almost certainly holding an arrangement of cards that has never before existed and will likely never exist again. – Yannay Khaikin … Continue reading

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Obscure Math Curiosity of the Day

The Fibonacci sequence: it’s everywhere.

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Adaptive Queries

Jeremy Kun has an amusing and startling trick: pick any polynomial \(p(x)=c_{0}+c_{1}x+\cdots+c_{n}x^{n}\) where the \(c_{i}\) are non-negative integers and the degree, \(n\), is any positive integer you like. Kun will then ask you one at a time for the value … Continue reading

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A Medical Decision Tree

Back in March, I wrote about Edward Frenkel and his explanation of the purported backdoor in the Dual_EC_DRBG random number generator. I also mentioned his book Love and Math: The Heart of Hidden Reality. Now Zygmunt Zając over at FastML … Continue reading

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