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Search options answers only not deleted created 2014-09-28 - 2015-09-28
204 votes
Accepted

Why do roots of polynomials tend to have absolute value close to 1?

Let me give an informal explanation using what little I know about complex analysis. Suppose that $p(z)=a_{0}+\dotsm+a_{n}z^{n}$ is a polynomial with random complex coefficients and suppose that $p(z) …
Joseph Van Name's user avatar
180 votes

Has philosophy ever clarified mathematics?

Two points: one, firstly understanding mathematical processes can be of immense pedagogical value. See e.g. Polya's How to Solve It (and he wrote a more academic book with these themes), or Lakatos' P …
136 votes

Has philosophy ever clarified mathematics?

I find the case of Alan Turing's development of the concept of computatibility to be an example. Before Turing, the logicians had no clear concept of what it means to say that a function is computable …
120 votes

Why do roots of polynomials tend to have absolute value close to 1?

A complete derivation can be found in the classical paper of Shepp and Vanderbei: Larry A. Shepp and Robert J. Vanderbei: The complex zeros of random polynomials, Trans. Amer. Math. Soc. 347 (1995), …
Igor Rivin's user avatar
  • 96.4k
114 votes

Are there any serious investigations of whether "mathematicians do their best work when they...

These two studies arrive at what seems to be a more sensible conclusion: Age and Scientific Performance, Stephen Cole (1976). The long-standing belief that age is negatively associated with scien …
110 votes

Did Bourbaki write a text on algebraic geometry?

Wrong! Here is Bourbaki document on algebraic geometry, taken from the now available Master's Archives: click on Autres rédactions, then on Chap.I Théorie globale élémentaire (91 p.) This prelimina …
Georges Elencwajg's user avatar
109 votes

Special rational numbers that appear as answers to natural questions

We have $$\int\limits_0^\infty {\frac{{\sin x}}{x}dx} = \int\limits_0^\infty {\frac{{\sin x}}{x}\frac{{\sin \left( {{x/3}} \right)}}{{{x/3}}}dx} = \ldots = \int\limits_0^\infty {\frac{{\sin x}}{ …
104 votes
Accepted

Is $\mathbb{R}^3 \setminus \mathbb{Q}^3$ simply connected?

Yes, the complement of any countable set in $\mathbb{R}^3$ is simply connected, by the Baire category theorem. Say your set is $X = \{x_1, x_2, ... \}$, and let $y$ be any point in $\mathbb{R}^3 \set …
Martin M. W.'s user avatar
  • 6,571
99 votes

Mathematical software wish list

I think some aspects of math would be revolutionized by having a good math search engine. Recently, a question was asked on Meta.MathStackExchange about what they perceived as the greatest problems fa …
91 votes
Accepted

Parodies of abstruse mathematical writing

Is this what you're looking for? http://thatsmathematics.com/mathgen/ Mathgen is an random math paper generator, based on SCIgen which does the same for computer science papers. It will provide you …
89 votes
Accepted

Is this differential identity known?

It's the Rodrigues formula for Gegenbauer polynomials $C_n^{(\alpha)}(x)$, in the special case $\alpha=-n/2$ when the polynomial is just unity. The general formula reads $$C_n^{(\alpha)}(x)=\frac{(- …
Carlo Beenakker's user avatar
88 votes

Why do roots of polynomials tend to have absolute value close to 1?

I think the following geometric argument is interesting and maybe sufficient to answer "why" at an intuitive level (?). When we take the powers of $x$ in the complex plane, the absolute value scales g …
usul's user avatar
  • 4,529
83 votes
Accepted

Derived algebraic geometry: how to reach research level math?

I propose the following plan, assuming a basic background in scheme theory and algebraic topology. I assume that you are interested in derived algebraic geometry from the point of view of application …
81 votes
Accepted

Why should have Peter May worked with CGWH instead of CGH in "The Geometry of Iterated Loop ...

I'm not quite certain what Peter May had in mind 40 years ago, but probably he had in mind the fact that pushouts are a lot better behaved in CGWH than in CGH. Specifically, CGWH is closed under push …
Peter May's user avatar
  • 30.4k
81 votes

Parodies of abstruse mathematical writing

The online version of the closing entry of Reports of the Midwest Category Seminar IV (1970, Springer LNM 137) costs $29.95 so I decided to place a transcript here. CATEGORICALLY, THE FINAL EXAMINATI …

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