Sunday 21 February 2016

27 Lines on a Cubic Surface


http://blogs.ams.org/visualinsight/2016/02/15/27-lines-on-a-cubic-surface/

Posted by Mathematicalcircles for Advance Learning on Sunday, February 21, 2016
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Define \(f: \mathbb{R} \rightarrow \mathbb{R}\) by \[f(x)= \begin{cases}(1-\cos x) \sin \left(\frac{1}{x}\right), & x \neq 0 \\ 0, &a...