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Oct
22
comment Tangent space to lie group at identity.
That's the product rule. Here I am identifying $G$ with a closed subgroup of $GL_n$ and doing all my calculations in the space of $n \times n$ matrices.
Oct
22
answered Tangent space to lie group at identity.
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