• Happenings – 2013 Jan 26

    Updated: 2013-01-26 17:35:45
    Since putting out the latest technical post, I haven’t done a whole lot. I’m falling a little behind in my two Coursera classes (Intro Computational Finance, and Image Processing)… I have not been playing with Matlab, not much anyway… I have an idea for the next control theory post, but I don’t know about getting [...]

  • Review of Xu Jiagu's Lecture Notes on Mathematical Olympiad Courses for Senior Section

    Updated: 2013-01-25 15:36:09
    A combined review of two volumes by Xu Jiagu, Lecture Notes on Mathematical Olympiad Courses

  • For any k greater than 3, Decompose Cyclic Quadrilaterals into k Cyclic Quadrilaterals

    Updated: 2013-01-25 15:36:08
    For any k greater than 3, Decompose Cyclic Quadrilaterals into k Cyclic Quadrilaterals

  • An Identity From the 2010 China Mathematical Competition

    Updated: 2013-01-22 00:04:40
    An algebraic identity of two sums is being proved in two ways: via an elegant observation and induction

  • Solve - an Olympiad Problem - in Your Mind

    Updated: 2013-01-21 06:34:44
    The question is to determine the sum of the roots of an equation; the sum depends on the number of roots - almost exclusively

  • Happenings – 2013 Jan 19

    Updated: 2013-01-19 16:54:43
    I’m slowly getting back into the saddle. As you can see, a technical post went out last Monday… the first in quite some time. Well, things slowed down around the holidays. We’ll see, however, if I manage to write up a tech post this weekend. I am also being distracted by taking two classes thru [...]

  • Normal loops in surfaces

    Updated: 2013-01-11 20:50:56
    I plan to write a post or two about normal surfaces and branched surfaces in three-dimensional manifolds, but I want to warm up first, with two posts about the two-dimensional analogues of these objects. Train tracks play a huge role in the approach to the topology of surfaces initiated by Nielsen and Thurston, for understanding [...]

  • Happenings – 2013 Jan 5

    Updated: 2013-01-05 16:07:46
    I haven’t even finished Xmas yet – still more friends to visit and gifts to exchange. I’m not planning a technical post for this Monday. Heck, I’m not even going to try yet to summarize the past year on the blog – I’m still working on my annual dead-tree letter. I have, however, found an [...]

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