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## Very cute math problemSuppose a_0, a_1, ..., a_n, ... are positive integers, and a_0 < a_1 < ... < a_n < ... Prove there's a unique n >= 1,… Started by Luara |
0 | yesterday |

## Puzzle in real analysisSuppose f is a continuous function on some open subset S of the real numbers, to the positive real numbers. Suppose the integral of f over… Started by Luara |
4 |
Apr 19 Reply by Luara |

## 1+2+3+4+5+... = -1/12A strange derivation: This sum 1+2+3+... = -1/12 is used in physics a lot believe it or not. This can be rationalized sort of: The Riemann… Started by Luara |
16 |
Mar 4 Reply by Luara |

## p-adics for undergraduates!I just finished reading the course in p-adics for undergraduates that I found online, making various annotations. It turns out this was a… Started by Luara |
0 | Jan 12 |

## Speaking of math errors ...I found this false lemma in a math text online: Suppose f: A --> B is a monotone bijection between two subsets of R (the real numbers). … Started by Luara |
3 |
Jan 5 Reply by Luara |

## Progress on twin primes conjecture by a non-expertThe twin primes conjecture says there are infinitely many primes p such that p+2 is also prime. A new proof by a mathematician who isn… Started by Luara |
0 | Sep 22, 2013 |

## Math and physics popularizations with substanceThere's a style of "popular" books about math and physics that involves actually learning some of the math and physics. They don't just ta… Started by Luara |
3 |
Jun 9, 2013 Reply by Luara |

## Math for Amateurs?Is there such a thing as an amateur mathematician? I mean I am slowly becoming infatuated with math and numbers, especially their abstract… Started by Ronni |
5 |
Mar 2, 2013 Reply by Luara |

## Fun math puzzleHere's a math puzzle for you: Suppose f is a function from the natural numbers (1,2,3...) to the natural numbers, and (f(m)+n)(f(n)+m) is a… Started by Luara |
3 |
Feb 25, 2013 Reply by Luara |

## I need help!I have a problem that seems really basic, but for whatever reason I keep messing up... f(r) = 7/(1+r)^2 Find the average value of the fun… Started by James Yount |
1 |
Sep 3, 2012 Reply by James Yount |

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