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user84413
  • Member for 12 years, 5 months
  • Last seen more than 7 years ago
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I teach calculus in CA.

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32
Proof of continuity of Thomae Function at irrationals.
Oct 17, 2013
21
Derivation of derangement with inclusion-exclusion
Sep 12, 2014
20
Does having a minimum along all lines imply that the function has a minimum?
Jul 3, 2014
20
Prove $\sum\limits_{i=0}^n\binom{i+k-1}{k-1}=\binom{n+k}{k}$ (a.k.a. Hockey-Stick Identity)
Jun 14, 2014
19
Showing that $Q_n=D_n+D_{n-1}$
Jul 24, 2013
19
Prove that $\frac{a_1^2}{a_1+b_1}+\cdots+\frac{a_n^2}{a_n+b_n} \geq \frac{1}{2}(a_1+\cdots+a_n).$
Dec 29, 2015
18
How to find a basis of an image of a linear transformation?
Aug 12, 2014
18
Prove If LCM(a,b) = c and a|k and b|k then c|k.
Oct 8, 2014
16
$\sum_{k=0}^{n/2} {n\choose{2k}}=\sum_{k=1}^{n/2} {n\choose{2k-1}}$, Combinatorial Proof:
Aug 3, 2013
15
Example 3.53 in Baby Rudin
Nov 21, 2014