Last time I introduced a neat little question: Is it true that every infinite path in contains arbitrarily long arithmetic progressions? For example, in the following path, the squares colored in red have coordinates , which form an arithmetic progression of length 3, where every two consecutive points differ by . As it turns out, … More Arithmetic progressions in space!
Dedicated to Harold Cohen, who died last year, and to his son AARON. I Grunting softly, the father slipped out of bed. The mother stirred the faintest amount, her shoulders sliding a sliver of a hair, noticing the sudden emptiness besides her. But her breathing kept its pace, and she remained in gentle slumber. No … More Three scenes from childhood
At the end of the semester, in order to see their grades, students at the Weizmann Institute must complete an online survey about each course they participated in. The survey asks questions about both the course and the teachers, and the results are then shown in a “previously, on ‘Topics in Holomorphy’ ”-styled section in … More Few courses are better
My piano is mentally ill. Now, you might be wondering how it is that a piano can be sick, but it’s an electronic piano (Korg SP250), and thus has a specialized electronic brain in charge of imitating the sound of tiny hammers hitting strings when I press its plastic keyboard. And like any brain, it … More Electric Insanity
My wife and I have a problem. Well, I mean, not a problem, per se. We are “of divided opinions”. She wants to have a baby. I want to program. The two are obviously incompatible. And it’s not that she doesn’t like to program, she loves it very much, coding away her will and command; … More Skin and bits
Or: fooling around with image processing kernels. Original greyscale: Edge fit + bw cutoff: Partition into multiple bw images and taking Laplacians: Plain Laplacian + bw cutoff: High frequency removal by partitioning into multiple bw images: Sexy dark high frequency removal: Subtracting low frequencies from original image: Overshooting Laplace central element (does this filter make … More The many faces of Mona Lisa
Facebook should change their “It’s complicated” status to “It’s complex”. That way, real people with imaginary girlfriends could spread the news to all their friends! – Ancient proverb We were learning about conformal maps in complex function theory. While we did plenty of “circles are sent to circles” and “connected components are sent to connected … More Programming complex transformations