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 Sep 24 awarded Autobiographer Aug 2 revised Generalizations of winding numbers deleted 183 characters in body Aug 2 revised Generalizations of winding numbers added 2 characters in body Aug 2 comment Generalizations of winding numbers yeah, your post gave me the same idea, which lead me to the idea of using the medial axis to give a metric. See if you like it. Aug 2 answered Generalizations of winding numbers Aug 2 comment Generalizations of winding numbers Good idea for the star case, although I was hoping for something for general simple-closed boundaries. Aug 1 comment How many different shapes can I make with this toy? It might be interesting to see what upper bounds can be discovered for this, as I imagine it would be hard to come up with the actual number. I spent a pleasant afternoon once discussing a similar problem: how may shapes could one have in a game of n-tris, a generalization of tetris where the shapes were all comprised of n connected squares with no holes. Aug 1 comment Generalizations of winding numbers @johnmangual, the fact that winding numbers are integers covers a multitude of rounding and truncation errors, but if I wanted to work harder I'd use a more robust method like vector crossing counts. I was using winding numbers as a quick way to get Mathematica's RegionPlot function to work with a fairly simple boundary. Anyway, my question is more one of curiousity, it's not tied to my work. Aug 1 asked Generalizations of winding numbers Nov 1 comment Name this concept: Comparing equal sized vectors vs. comparing features You might want to ask this on astronomy.stackexchange.com. I think they do something similar to align sequences of images in order to get an enhanced composite image. Sep 29 comment circle that touch quadrantal internally @J.M.: I'm assuming kim want's the inscribed circle Sep 29 answered circle that touch quadrantal internally Sep 26 answered Family of 2x2 linear equations Sep 26 comment Why is this curve convex? Are you sure they want you to use polar coordinates? You could put $\theta$ on the x axis and r on the y axis. Sep 26 revised Probability distribution function added 29 characters in body Sep 26 revised Probability distribution function added 131 characters in body Sep 26 revised Probability distribution function added 131 characters in body Sep 26 answered Probability distribution function Sep 21 comment 4 items add up to and multiply to 7.11 what are the value of the items? @anon: Right you are! (duh!) Sep 21 comment 4 items add up to and multiply to 7.11 what are the value of the items? @anon: if $\pi$ is too expensive, maybe I can just buy a piece?