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 Aug 8 comment How many circles are needed to cover a rectangle? I guess I should have noticed it before. :-/ Aug 8 revised How many circles are needed to cover a rectangle? added 61 characters in body Aug 8 comment How many circles are needed to cover a rectangle? @Fabian Yup, I am more interested in how to approach these problems. Aug 8 asked How many circles are needed to cover a rectangle? Aug 4 comment $L_{2}$ norm of the gradient of a vector valued function. You are correct, Silly me. Sorry for the bother. Aug 4 comment $L_{2}$ norm of the gradient of a vector valued function. Yeah I meant that too, I was talking about its norm. Aug 4 comment $L_{2}$ norm of the gradient of a vector valued function. @Brhn What is the context of the problem? Is there any more information you can provide? Aug 4 comment $L_{2}$ norm of the gradient of a vector valued function. I know your answer is assuming things due to lack of information from the OP, but as I guess the the "gradient" is basically a jacobian matrix between the two sets of variables and hence its norm must be the Frobenius norm or a spectral norm of a matrix. I am not sure though. Aug 4 comment Solving $x^4-y^4=z^2$ @Brhn Please accept the answer if the answer is correct and you are satisfied with it, else please let us know if you have some more doubts. Aug 4 comment 'Linux' math program with interactive terminal? @Magpie Its QtOctave Aug 4 comment Additive quotient group $\mathbb{Q}/\mathbb{Z}$ is isomorphic to the multiplicative group of roots of unity I will say every $\mathbb{Q/Z}$ is isomorphic to $X = \left\{x : x \in [0,1] \text{ and }x \in \mathbb{Q} \right\}$ Aug 4 revised All possibilities of seven numbers in ascending order? Made links pretty. and added LaTeX. Aug 4 suggested approved edit on All possibilities of seven numbers in ascending order? Aug 4 comment Boundedness in a topological space? If you have found the answer helpful and correct, please accept it else let people know what more do you want from the answer. :-) Aug 3 comment Prove that $(n+\sqrt{n^2 -1})^k$ will always be of the form$(t+\sqrt{t^2 -1})$ where $n$, $k$, $t$ are natural numbers @RajeshKSingh: Do you remember where you found it? There might be something more to it. Aug 2 comment What is a good complex analysis textbook? @ChangweiZhou: Seriously man? In high school? Swell! Aug 2 comment Show $\lim_{h \to 0} \frac{f(h)+f(-h)}{h^2}=f''(0)$ @Ranabir: Yes, you can write $f''(0)=\lim_{h \to 0} \frac{f'(0)-f'(-h)}{h}$. This is because, $f''(0)$ is said to exist only when both the right and left hand limits exists and are equal to each other. Aug 2 comment Solving for $v$ in $v'(t) + R(t)\cdot v^{2/3}=J(t)$ @LeoIzen: $R(t)$ is a constant? Aug 2 revised Solving for $v$ in $v'(t) + R(t)\cdot v^{2/3}=J(t)$ Changed the hyperlinks to make it easy to read without taking the focus away. Aug 2 comment Solving for $v$ in $v'(t) + R(t)\cdot v^{2/3}=J(t)$ I edited your answer to make the hyperlinks appear pretty so that it is easier to read and does not take focus away from your answer. :-)