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Jun
22
answered When is the restriction of a normal operator not normal?
Jun
20
answered Enough evidence to conclude that a linear operator is diagonalizable
Jun
18
awarded  Necromancer
Jun
18
answered Let $T:\mathbb{R}^n \to \mathbb{R}^n $ be Symmetric, $tr({T^2})=0$. Show that $T=0$.
Jun
18
comment If $A$ is a $12 \times 12$ real matrix such that $A^{17}=I$ , is $A$ diagonalizable ? Are all eigenvalues of $A$ real ?
Of course. I've added a clarification, thanks.
Jun
18
revised If $A$ is a $12 \times 12$ real matrix such that $A^{17}=I$ , is $A$ diagonalizable ? Are all eigenvalues of $A$ real ?
added 19 characters in body
Jun
17
answered If $A$ is a $12 \times 12$ real matrix such that $A^{17}=I$ , is $A$ diagonalizable ? Are all eigenvalues of $A$ real ?
May
28
answered Are there spaces that 'look the same' at every point, but are not homogeneous?
May
28
answered Does map induced by rotation preserve the volume form?
May
26
awarded  Yearling
May
13
answered The difference between the algebraic torus and the geometric torus
May
13
comment $\sum_{k=1}^\infty\frac{kx^{k-1}}{(k-1)!}=e^x$?
The last line. You forgot the $E(X)^2$ term.
May
13
comment $\sum_{k=1}^\infty\frac{kx^{k-1}}{(k-1)!}=e^x$?
The variance is $E(X^2) - E(X)^2$, not $E(X^2)$. The manipulation of the power series is correct, but the last formula isn't.
May
13
comment $\sum_{k=1}^\infty\frac{kx^{k-1}}{(k-1)!}=e^x$?
You are not wrong.
May
13
revised Naturality in linear algebra
added 96 characters in body
May
13
answered Naturality in linear algebra
May
10
revised Question about radius of convergence.
added 10 characters in body
May
10
revised Question about radius of convergence.
added 10 characters in body
May
10
answered Question about radius of convergence.
May
10
revised D'Alembert's functional equation. I need to solve this problem
added latex rendering