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DavidP

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  • New York, United States
  • Member for 3 years, 9 months
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Top Posts (212) All Questions Answers | Votes Newest

47 An example of a problem which is difficult but is made easier when a diagram is drawn Jan 11 '15
11 Should I be afraid of using known identities that I can't prove? Oct 9 '14
9 Is there an online calculator in which you can type a number and have it tell you if it could be a Lychrel number or not? Dec 27 '14
8 Finding polynomials with their values at points Nov 28 '14
8 What is good chalk for lecturing? May 23 '13
8 If $(m,n)\in\mathbb Z_+^2$ satisfies $3m^2+m = 4n^2+n$ then $(m-n)$ is a perfect square. Feb 18 '14
7 Does $\lim_{R \to \infty} \int_{C_{R}} e^{iz} \ dz = 0$? Jan 13 '14
7 Probability that 2 appears at an earlier position than any other even number in a permutation of 1-20 Feb 8 '14
7 Prove $4^k - 1$ is divisible by $3$ for $k = 1, 2, 3, \dots$ Dec 21 '14
6 Show that $\sum\limits_{i=0}^{n/2} {n-i\choose i}2^i = \frac13(2^{n+1}+(-1)^n)$ Nov 28 '14
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