The Weierstrass Function f_a(x) = \sum^{\infty}_{k=1}\frac{\sin(\pi k^a x)}{\pi k^a} shaded grayscale image that looks like fog in a forest
https://cdn.fosstodon.org/media_attachments/files/111/330/318/409/710/150/original/09d24c3bb3c2550e.jpg
@mcnees
Thank you for the nice t(h)rea(d|t)!
Our “chief mathematician” has this on a poster, generated with Mathematica and ConTeXt MkII (in 2006). 0 < a < 1, 0 < x < 1
Discussion how to do it in MetaPost is ongoing 😉
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