Re:Mathematicians Are Hoarding a Type of Japanese Chalk
by quasiresearcher on Monday June 15, 2015 @11:19PM
(#9723609)
I remember a discussion about this on MathOverlow http://mathoverflow.net/questions/26267/where-to-buy-premium...
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Re:Mathematicians Are Hoarding a Type of Japanese Chalk
by monochromatic on Tuesday June 16, 2015 @12:32AM
(#9723839)
I remember that being linked from this article.