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# 43 Posts

 Sep22 asked Why exactly can you take the absolute value of one side of this inequality and assume it is still true? Sep20 asked Why is it that $\left|b_n - b \right| < \frac{\left|b \right|}{2} \Rightarrow \left| b_n \right| > \frac{\left|b \right|}{2}$? Sep7 asked What is the explanation for the elements of this set? Aug19 asked What are the explanations for certain steps in these proofs for the irrationality/rationality of certain numbers? Jul5 asked For which $k \in \mathbb{R}$ will this be a euclidean vector space? Jul3 asked Help understanding this example of a linear operator which rotates each vector $v$ about the z-axis by an angle $\theta$ Jun30 asked Understanding this partial derivative problem Jun4 asked Does this equality always hold? May14 asked Are bounded sequences always strictly less than some fixed number $M$? May6 asked Who was the mathematician who thought “god” was out to get him? Apr26 asked How is it shown that a Hermitian matrix will be positive definite? Apr23 asked What is the difference between finding a basis for a complex and a real space? Apr17 asked How to show certain things related to scalar products Apr17 asked Subtraction and division with integers modulo 3 Apr16 asked How do you show this property of a differentiable function given information about the derivative? Apr10 asked What is the best way to show that no positive powers of this matrix will be the identity matrix? Mar29 asked Why does $a_n = (1+\frac{2}{n})^{n}$ converge to $e^2$? Mar13 asked Proving elementary inverse image consequence Mar7 asked Proving $(2n+1) + (2n+3) + \cdots + (4n-1) = 3n^{2}$ for all positive integers $n$ Feb12 asked Why is the 'change-of-basis matrix' called such?