For me those are references to the same thing. On Wikipedia there are references to both but I still don't see the difference. http://en.wikipedia.or...

Problem Statement Show how the $L_1$-sparse reconstruction problem: $$\min_{x}{\left\lVert x\right\rVert}_1 \quad \text{subject to} \; y=Ax$$ can be reduc...

I have a simple question that I need clarification on: If $$\log(a) = \log(b) + c$$ is it true that $$a = b + \exp(c)$$ Is this correct or am I missing so...

Suppose that you have a map $i: A\rightarrow X$ between CGWH (compactly generated weakly Hausdorff) spaces. It is true that if it is a cofibration in CGWH...

Suppose that the $o(gH) = n \in \frac{G}{H}$ where $\frac{G}{H}$ is the quotient group. Show that if the $o(g) = m \in G$ then $n$ divides $m$ I want to u...

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The concept of determinant is quite unmotivational topic to introduce. Textbooks use such "strung out" introductions like axiomatic definition, Laplace ex...

Quoted from Kiselev's geometry: Planimetry, page 18 section 27, (1) If the sum of several angles that have a common vertex is congruent to a straight...

Is it possible to define a group as a category? What exactly will be objects of this category and how will we say that every element should have an inverse?

Recently, I encountered a problem about infinite series. So my question is how to know whether the infinite series $\sum _{n=2}^{\infty } \frac{1}{n \log ...