Reputation
10,668
Next privilege 15,000 Rep.
Protect questions
Badges
1 12 28
Newest
 Constituent
Impact
~170k people reached

Oct
22
answered Tool for expressing $x=f^{-1}(y)$ if $y=f(x)$ is given
Oct
22
revised Tool for expressing $x=f^{-1}(y)$ if $y=f(x)$ is given
edited title
Oct
22
revised Help in simplifying this double summation
fixed grammar
Oct
22
revised find the intersecting line in the provided planes $( 3x+2y+z = -1 ; 2x-y+4z=5)$
fixed LaTex formatting
Oct
22
revised Find an orthonormal basis for W and $W^{\perp}$
fixed LaTex formatting
Oct
22
revised L'Hospital's Rule to find limit
cleaned up formatting and presentation
Oct
22
awarded  Enlightened
Oct
22
awarded  Nice Answer
Oct
22
reviewed Approve L'Hospital's Rule to find limit
Oct
22
answered Whether a matrix is a zero matrix
Oct
21
answered Find basis of 4x3 Matrix
Oct
21
answered Algebraic Proofs in Combinatotics
Oct
16
answered Solve $\sqrt{3x}+\sqrt{2x}=17$
Oct
15
comment Proving or disproving A+B is invertible
@anderstood: You're absolutely right. My nitpick was a (very, very minor) aesthetic one, not a critique of the actual content.
Oct
15
awarded  Yearling
Oct
14
comment Proving or disproving A+B is invertible
And now you have a second proof that $AB \neq BA$ for your specific example! ;) Small nitpick: if we're assuming $A$ is $k$-nilpotent, then the sum in your formula needs only to run from $i = 0$ to $i = k - 1$.
Oct
14
answered Proving or disproving A+B is invertible
Oct
14
answered A question about Klaus Hulek algebraic geometry
Oct
14
revised What is the ratio between the speed of the boat and speed of the water current?
edited tags
Oct
12
comment Is it true that $\langle a+cb, a+cb\rangle = \langle a,a\rangle + c^2 \langle b,b\rangle $ where $a,b \in \mathbb{R}^n$ and $c \in \mathbb{R}$?
It's not true in general. You need either $c = 0$ or $\langle a, b \rangle = 0$.