» Math problem #241 (Solution)
5 hours ago by Virtual Math Tutor from Virtual Math Tutor
Solution to Math problem #241: First, we determine the domain of the function on the left hand side, it is obviously $x ge 0.$ Now, the equation reduces to the following systems $$egin{cases} x ge 0, \ sqrt{x} = 0, end{cases}$$ or, $$egin{cases} x ge 0, \ x^2 - 1 = 0. end{cases}$$ Therefore the two admissible solutions are $x_1 = 0$ and $x_2 = 1$. The problem is now completely solved. ...

» MATLAB Documentation
5 hours ago by Loren on the Art of MATLAB from Loren Shure
For quite a while now, we have made MathWorks product documentation available from the support page on our web site. Though we started with MATLAB documentation initially, we have added documentation for all the rest of our products and have hosted a complete set on the mathworks.com for quite some time now. As you likely [...]

» The cost of knowledge
19 hours ago by What's new from Terence Tao
A few days ago, inspired by this recent post of Tim Gowers, a web page entitled “the cost of knowledge” has been set up as a location for mathematicians and other academics to declare a protest against the academic publishing practices of Reed Elsevier, in particular with regard to their exceptionally high journal prices, their [...]

» Twenty weeks down to twenty minutes
1 day ago by The Endeavour from John
I had a simulation this week that I estimated would take 20 weeks to run. This estimate was based on too small a run. A more reliable estimate based on a longer run was 300 CPU hours, about two weeks running on a single processor. Before I split the problem up to run in parallel, [...]

» Mathematics of a Serial Killer
1 day ago by Ars Mathematica from Walt
Someone sent me a link to this story about a mathematical model of a particular serial killer’s behavior. Two things struck me about it: How much it sounded like the kind of bizarre model you’d see on Charline on Numb3rs … Continue reading →

» Arrowed Lines in Freehand Drawing Library
1 day ago by The Algorithmist from algorithmist
Drawing lines does not sound very interesting, but in addition to my own app. development, another user expressed a desire for animated arrowed lines.  So, a new two-point stroke has been added to the library.  The TwoPoint class is the base for a family of classes in which a stroke is defined only by a [...]

» Generating Hilbert curves
1 day ago by Steve on Image Processing from Steve Eddins
This week I came across some files I wrote about 16 years ago to compute Hilbert curves. A Hilbert curve is a type of fractal curve; here is a sample: I can't remember why I was working on this. Possibly I was anticipating that 16 years in the future, during an unusually mild New England [...]

» The most brutal man page
1 day ago by The Endeavour from John
In The Linux Command Line, the author describes the bash man page* as “the most brutal man page of them all.” Many man pages are hard to read, but I think that the grand prize for difficulty has to go to the man page for bash. As I was doing my research for this book, I [...]

» Review: The Linux Command Line
2 days ago by The Endeavour from John
No Starch Press recently released The Linux Command Line: A Complete Introduction by William E. Shotts, Jr. True to its name, the book is about using Linux from command line. It’s not an encyclopedia of Linux. It doesn’t explain how to install Linux, doesn’t go into system APIs, and says little about how to administer Linux. [...]

» Color-coded surgery
2 days ago by The Endeavour from John
This is the most encouraging thing I’ve seen in cancer research in some time: a way to make tumors fluoresce. This allows surgeons to see tumor boundaries. From TED

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