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Barry Cipra

Author of Misteaks, and how to find them before the teacher does (a calculus supplement).

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  • Member for 6 years, 10 months
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141 Why does L'Hopital's rule fail in calculating $\lim_{x \to \infty} \frac{x}{x+\sin(x)}$? Mar 23 '16
107 How do people perform mental arithmetic for complicated expressions? Aug 11 '15
92 Hanging a picture on the wall using two nails in such a way that removing any nail makes the picture fall down May 8 '14
86 Identification of a quadrilateral as a trapezoid, rectangle, or square May 19 '15
67 Is there a “positive” definition for irrational numbers? Sep 6 '16
63 Prove that for every three non-zero integers, a,b and c, at least one of the three products ab,ac,bc is positive Nov 13 '15
57 Inequality from Chapter 5 of the book *How to Think Like a Mathematician* Feb 26 '15
51 A six-sided die is rolled 5 times. The roller wins if the last roll is the same as one of the previous rolls. Dec 8 '16
46 Examples of mathematical discoveries which were kept as a secret Nov 3 '14
44 Is this an ellipse? Jun 12 '17
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