Here's the same thing for a 2×2 grid. The triangle in the middle has to go one way or the other, so you have to break the vertical line of symmetry
accessibility, color contrast
TIL current color contrast calculations create lots of false positives and false negatives.
This work looks amazing:
also: "Color Science Researcher"
Consider the algorithm "M(x): if x<0 return -x, else return M(x-M(x-1))/2". This algorithm terminates for all real x, though this is not so easy to prove. In fact, Peano Arithmetic cannot prove the statement "M(x) terminates for all natural x". Paper to come! Joint work with @jeffgerickson and @alreadydone
kickstarter, math circle book
Oooh, a friend of mine is co-authoring a math circle book.
It's financed by using Kickstarter (essentially, as pre-ordering) with lots of other levels/perks.
And the result will be CC licensed, too! Sweet.
Does *your* calculator give the numbers happy little emoji names?
@christianp Nice. I wish there were a way to do the same at arXiv, but things are a bit too dense there.
What I use most often at arXiv does work at MathWorld though: http://mathworld.wolfram.com/search/?query=%22open+problem%22
Recipe for instant #math delight: search MathWorld for the word "surprisingly"
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