bio | website | zakuski.math.utsa.edu/~jagy |
---|---|---|

location | Berkeley, California | |

age | 58 | |

visits | member for | 5 years, 4 months |

seen | 5 hours ago | |

stats | profile views | 15,033 |

My main activity is in number theory of integral positive ternary quadratic forms. This began through years of working with Irving Kaplansky. Much of his unpublished writing on quadratic forms can be found as pdfs at
http://zakuski.math.utsa.edu/~kap/forms.html
and about Lie and Jordan superalgebras at
http://zakuski.math.utsa.edu/~kap/superalgebra.html
One of my own email addresses can be found easily using the search feature at
http://www.ams.org/cml
and just putting in my last name

May 24 |
comment |
Spherical cap is the only compact constant mean curvature surface bounded by a circle
Tom, your surfaces, dropping the compactness condition, are solutions of a second order ODE. Most of them need two circle boundaries to end up compact, for example an ordinary circular cylinder cut off at two circular ends. "In 1841 Delaunay proved that the only surfaces of revolution with constant mean curvature were the surfaces obtained by rotating the roulettes of the conics. These are the plane, cylinder, sphere, the catenoid, the unduloid and nodoid" |

May 24 |
comment |
Spherical cap is the only compact constant mean curvature surface bounded by a circle
@YoavKallus, not compact, Riemann made a minimal surface of a sort of staircase shape, in every parallel plane the intersection with the surface is either a circle or a line. |

May 20 |
revised |
On Polynomials dividing Exponentials
added 77 characters in body |

May 20 |
revised |
On Polynomials dividing Exponentials
added 11 characters in body |

May 20 |
revised |
On Polynomials dividing Exponentials
added 375 characters in body |

May 20 |
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On Polynomials dividing Exponentials
@GerryMyerson, Max Alekseyev has the second edition of the book, and says the reads $$ m^2 - 1 \; | \; 3^m + \left( n! - 2 \right)^m, $$ so it really is off by just a single number and was a typo in the first edition. Good to know.
corrected question |

May 20 |
comment |
On Polynomials dividing Exponentials
@MaxAlekseyev, aha! So it may really have been a typo in the first edition, just a single number different. That makes me feel a bit better about the authors; in 2010 I was less than charitable (then deleted some stuff here). |

May 20 |
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Theory of C* algebras over other fields than the complex numbers
@NateAckerman, did you have some specific title for an article that you cannot find? I refer to your MSE question math.stackexchange.com/questions/1290667/… |

May 20 |
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Theory of C* algebras over other fields than the complex numbers
@YemonChoi,see math.stackexchange.com/questions/1290667/… where it appears that Nate has found one or more citations of interest but is unable to get more detail |

May 20 |
comment |
On Polynomials dividing Exponentials
@MaxAlekseyev, see one of my answers, I pasted in the page with the actual problem. I also put a link to the current (second) edition of the book, which I do not plan to purchase. Since the problem did not work out, they may simply have deleted it for the second edition without comment. For more information, it would be necessary to contact Andreescu or Dospinescu. |

May 20 |
revised |
On Polynomials dividing Exponentials
added 306 characters in body |

May 20 |
revised |
On Polynomials dividing Exponentials
added 39 characters in body |

May 20 |
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On Polynomials dividing Exponentials
@GerryMyerson, I fixed the link, however it points to a second edition of the book, which probably lacks this problem. I have a scanner, I imagine the thing to do is scan in the page from the first edition with this exact problem. |

May 20 |
revised |
On Polynomials dividing Exponentials
added 39 characters in body |

May 13 |
comment |
Explanation of the definition of Saturated Sets in Lambda Calculus
found it, mathoverflow.net/questions/89054/… |

May 13 |
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Explanation of the definition of Saturated Sets in Lambda Calculus
My best exchange on language here was a question where I said I was expired by a previous question rather than inspired by it. A French guy asked me if i were serious and said that the analogous phrase (inspired by) in French is also used too much. |

May 13 |
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Explanation of the definition of Saturated Sets in Lambda Calculus
urbandictionary.com/define.php?term=Delucidate although there seems to be a real word in Italian... |

May 12 |
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An algorithm for Poincare recurrence time
how do you do $$ \cos (t) + \cos (\sqrt{2} t) + \cos (\sqrt{3} t) > 3 - 10^{-9}? $$ |

May 11 |
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What sort of models did Bolyai and Lobachevsky use to demonstrate the consistency of their models of non-Euclidean Geometry?
My take, from having published on this, is that Bolyai did not make any model in our sense, he predicted everything that had to happen and said he had created a new world. Gauss was less than gracious, having come to many of the same conclusions; I give Bolyai greater credit, he actually said this is it. |

May 3 |
awarded | Popular Question |