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 Sep 22 asked Why exactly can you take the absolute value of one side of this inequality and assume it is still true? Sep 20 asked Why is it that $\left|b_n - b \right| < \frac{\left|b \right|}{2} \Rightarrow \left| b_n \right| > \frac{\left|b \right|}{2}$? Sep 7 asked What is the explanation for the elements of this set? Aug 19 asked What are the explanations for certain steps in these proofs for the irrationality/rationality of certain numbers? Jul 5 asked For which $k \in \mathbb{R}$ will this be a euclidean vector space? Jul 3 asked Help understanding this example of a linear operator which rotates each vector $v$ about the z-axis by an angle $\theta$ Jun 30 asked Understanding this partial derivative problem Jun 4 asked Does this equality always hold? May 14 asked Are bounded sequences always strictly less than some fixed number $M$? May 6 asked Who was the mathematician who thought “god” was out to get him? Apr 26 asked How is it shown that a Hermitian matrix will be positive definite? Apr 23 asked What is the difference between finding a basis for a complex and a real space? Apr 17 asked How to show certain things related to scalar products Apr 17 asked Subtraction and division with integers modulo 3 Apr 16 asked How do you show this property of a differentiable function given information about the derivative? Apr 10 asked What is the best way to show that no positive powers of this matrix will be the identity matrix? Mar 29 asked Why does $a_n = (1+\frac{2}{n})^{n}$ converge to $e^2$? Mar 13 asked Proving elementary inverse image consequence Mar 7 asked Proving $(2n+1) + (2n+3) + \cdots + (4n-1) = 3n^{2}$ for all positive integers $n$ Feb 12 asked Why is the 'change-of-basis matrix' called such?