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Mathematics
Bruno Joyal's user avatar
Bruno Joyal's user avatar
Bruno Joyal's user avatar
Bruno Joyal
  • Member for 13 years, 6 months
  • Last seen more than a month ago
  • Montréal, Québec
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Some fun answers of mine:

A real number $x$ such that $x^n$ and $(x+1)^n$ are rational is itself rational

A series of rationals whose every subseries is irrational

Is every rigid field perfect?

Prove $\sum^{\infty}_{n=1} \frac{a_{n+1}-a_{n}}{a_{n}}=\infty$ for an increasing sequence $a_n$ of positive integers

The prime spectrum of a Dedekind domain

A fun integral

The same integral, solved in another way

All elements in $\mathbb{Z}/n\mathbb{Z}$ are representable as sum of a square and a cube?

Algebraic varieties in $\mathbf C^n$ have no interior points

A function with a critical point

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Top posts
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answer
177
Is computer science a branch of mathematics?
Jan 24, 2014
question
114
Gross-Zagier formulae outside of number theory
Jan 2, 2014
answer
103
Why can't you square both sides of an equation?
Nov 16, 2013
answer
96
What is the proof that the total number of subsets of a set is $2^n$?
Oct 31, 2013
question
63
How to explain to the layperson what mathematics is, why it's important, and why it's interesting [closed]
Dec 7, 2011
answer
54
Surprising applications of cohomology
Mar 22, 2014
answer
51
A real number $x$ such that $x^n$ and $(x+1)^n$ are rational is itself rational
Dec 16, 2014
answer
51
Tensor products commute with direct limits
Mar 28, 2012
answer
51
Are there any open mathematical puzzles?
Oct 19, 2013
answer
49
Prime dividing the binomial coefficients
Jul 14, 2011
Top network posts
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61
"Gross-Zagier" formulae outside of number theory
37
Is Langlands reciprocity somehow analogous to the wave-particle duality of quantum mechanics?
35
Is my field algebraically closed?
30
Elliptic curve over a scheme is a group scheme?
28
Is there an algebraic curve over Q which is not modular?