Best of 2009

The blog posts Hacker News loved most in 2009. 1,923 posts.

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Beautiful plots of roots of polynomials

Click on the picture for bigger view. Roots of quadratic polynomials are in grey; roots of cubics are in cyan; roots of quartics are in red and roots of quintics are in black. The horizontal axis of symmetry is the real axis; the vertical axis of symmetry is the imaginary axis. The big hole in the middle is centered…