8,730 reputation
31152
bio website
location
age
visits member for 2 years, 4 months
seen 6 hours ago

14h
answered Finding complex solution to $X^2 = A$
17h
comment Prove that $|x+y| \leq |x|+|y|$
en.wikipedia.org/wiki/Triangle_inequality
17h
reviewed Approve suggested edit on Algebra: What does “is defined for” mean?
20h
comment Who's the top rank on this site?
see math.stackexchange.com/users?tab=Reputation&filter=all
1d
comment Linear Algebra: Direct Sum
@MiguelLanderos - $W_2$ is defined as a span of a set of vectors and hence is a subspace. You still need to show that the only vector in the intersection is the zero vector, can you show it ?
1d
answered Linear Algebra: Direct Sum
1d
answered Set difference of real numbers and rational numbers
1d
revised Set difference of real numbers and rational numbers
edited tags
1d
answered Why is $\mathbb{R}/\mathbb{Z}$ isomorphic to the complex numbers of length one?
2d
answered Linear algebra proof that AB = On with A invertible only if B = On
2d
answered How to show that $\mathbb Q(\sqrt 2)$ is not field isomorphic to $\mathbb Q(\sqrt 3).$
Apr
5
comment Reference request: An example of a false conjecture with a very large number as the first counter example
@Amzoti - Yes, thank you
Apr
5
revised Reference request: An example of a false conjecture with a very large number as the first counter example
deleted 1 characters in body; edited title
Apr
5
asked Reference request: An example of a false conjecture with a very large number as the first counter example
Apr
5
reviewed Approve suggested edit on How to solve $x$ in $(x+1)^4+(x-1)^4=16$?
Apr
5
answered how to find the root in $x^3-x^2+6x+24$?
Apr
5
answered Show that if $A^3=0$ but $A^2\ne0$, then $A^2v=0$ has a nontrivial solution
Apr
5
revised Computing $\langle\sin(\gamma_i)\rangle= \int_{(S^2)^N} \sin(\gamma_i)p(\Theta)dS$
edited title
Apr
5
answered I already know that empty set is a basis for {0}. Then, can {0} be a basis for {0}??
Apr
3
comment Proving whether a squared function has double pole at $z_0$
I believe that we need to take $h$ s.t $h(z_0)\neq 0$. Otherwise we can choose $h(z)=f(z)(z-z_0)$..