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# Posts

### May 24, 2013

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考虑这么一个 14 位数 02565413989732 ，如图所示，它的数字先逐渐变大，然后开始变小，再变大，再变小，再变大，再变小。我们就说，它一共包含了 6 个单调区间。我们的问题就是：一个 n 位数平均有多少个单调区间？为了避免歧义，我们假设任意两位相邻的数字都不相同，因而像 77765589911 [â€¦]
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如图，把边长为 d 的正方形放在两条距离也为 d 的平行线之间，于是产生了四个交点。求证，把这四个点交叉相连产生的夹角为 45° 。                  只需要注意到，如果两条距离为 d [â€¦]
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(5 * 2) - 4 = 1 * 3! Also: |5 - 2 - 4| = 1^3 Also: 5 = (2 * 4) - (1 * 3)
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I had hoped that The Future of Scholarly Mathematical Intercourse would arrive chaperoned by The Future of Publishing. The first papers in Cambridge University Press’s new journals, Forum of Mathematics Pi and Forum of Mathematics Sigma, have been published — $p$-adic Hodge theory for rigid-analytic varieties by Peter Scholze in FoM Pi, and Generic mixing... Read more »
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Professor Barbara Keyfitz, President of the International Council for Industrial and Applied Mathematics (ICIAM), has issued a call for nominations for five prizes it will award at its 8th International Congress in Beijing in August 2015. The prizes are: Collatz Prize, which recognises outstanding work on industrial and applied mathematics by an individual under 42... Read more »
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The meme says it all: It’s time. As a build-up to the end of the term, I’ll be posting a meme everyday and explaining the context behind these memes. Most memes […]
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Bad Decisions 1. “Follow the disaster” to save money on travel. In the language of Nassim Taleb, this is a very fragile strategy. 2. Going into debt to attend weddings Good Decisions 1. How to attend a conference (via HackerNews) 2. A tip to enjoy your decisions better 3. Learn to write well: “the vast [...]
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Book of interest: Jane Austen, Game Theorist. Thanks to Ian for emailing this to me. In 230 diagram-heavy pages, Mr. Chwe argues that Austen isn’t merely fodder for game-theoretical analysis, but an unacknowledged founder of the discipline itself: a kind of Empire-waisted version of the mathematician and cold war thinker John von Neumann, ruthlessly breaking [...]
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No summary available for this post.

### May 23, 2013

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For the physics crowd....Eric Weinstein via WikipediaWhen Peter Woit writes about mathematician/economist Eric Weinstein and surfer-physicist Garrett Lisi in the same post, well, I have to take note of it!:http://www.math.columbia.edu/~woit/wordpress/?p=5927Weinstein is apparently giving a lecture at Oxford today (invited by Marcus du Sautoy) on some mathematical physics ideas (called "Geometric Unity") he has been working on for awhile (but not shared much about), which Woit analogizes to the [â€¦]
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Bad Decisions More Doctors Smoke Camels! Image by Don O’Brien, CC BY 2.0 1. Following health advice from advertisements 2. Comparing the cost of preservative free, fresh homemade bread with mass-produced store bought bread 3. Abusing the expense account Good Decisions 1. How I converted 20,000 users, with a \$50 budget in 1 month. (But [...]
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|5 - (2 * 3)| = 1^3 Also: (5 * 2) - 3 - 1 = 3! Also: 5 - 2 = 3 = 1 * 3
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No summary available for this post.
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Sketches from Money on the Bench at The blog of the New York Times Graphics Department I admire the amount of work that went into creating their graphic. Cicadas and prime numbers at The New Yorker Prime numbers, however, can only be divided by themselves and one; they cannot be evenly divided into smaller integers. [...]
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(Click on the cartoon to see the full image.) (C)Copyright 2013, C. Burke.FYI: Caprona is the name of that island (although the book title is just Land) where dinosaurs live in the caves and burrows.
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### May 22, 2013

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[ The post-apocalyptic bio-weapon ravaged future, where the only two habitable places on Earth are England and Australia, which connected to each other only by a single gravity train called The Fall. ] Colin Farrell: I’m a blue-collar working-class guy … Continue reading →
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Solve for x: Please visit  [...]
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5 + 2 - 2 + 1 = 3! Also: 5 = |2 - (21 / 3)| Also: 5 - 2 - 2 = 1^3
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<- PREV              INDEXSine decided not to follow up by asking why Mink kept talking in questions. "Do the two of you live around here?" she asked instead."Oh no," Con responded. "This is just a quiet place where we come to think. Well, among doing other things, nudge nudge, wink wink.""Then, if you know the area," Cosecant said quickly, waving her hand to prevent Con's gaze from slipping back to his wife, "Perhaps you can give us directions. Or draw us [â€¦]
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"I had better say something here about this question of age, since it is particularly important for mathematicians. No mathematician should ever allow himself to forget that mathematics, more than any other art or science, is a young man's game. ... I do not know an instance of a major mathematical advance initiated by a man past fifty. If a man of mature age loses interest in and abandons mathematics, the loss is not likely to be very serious either for mathematics or for himself."That's what [â€¦]
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“No mathematician in the world would bother making these senseless distinctions: is a “mixed number ” while is an “improper fraction.” They’re EQUAL for crying out loud. They are the […]
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Pound Foolish by Helaine Olen is an excellent exposé of the personal finance industry. After reading it, you’ll never look at a talking head on TV the same way. It seems many personal finance advisors have an attitude of “Do what I say, not what I do.” Here are a few examples from the book. [...]
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