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Apr
17
revised Definition of an Integral Domain in the second edition of Herstein's Topics in Algebra
I did mean zero divisors, not non-zero divisors.
Apr
16
asked Definition of an Integral Domain in the second edition of Herstein's Topics in Algebra
Feb
10
comment Find $c=c(n)$ so $T = c \sum_{i=1}^{n} |X_{i}|$ is an unbiased estimator.
And unbiased estimator of what? $\sigma$ ?
Feb
10
comment Find $c=c(n)$ so $T = c \sum_{i=1}^{n} |X_{i}|$ is an unbiased estimator.
Why do you need to calculate the variance of $T$?
Feb
1
comment Show that $X_1^T[I_n - X({X^T}X)^{-1}X^T] = 0$
Note that if you can write $X_1 = XC$ for some $C$ you are done.
Feb
1
revised heat equation on a surface
corrected spelling
Feb
1
suggested approved edit on heat equation on a surface
Jan
31
accepted Matrix with maximal rank in a family of matrices
Jan
30
revised Matrix with maximal rank in a family of matrices
fixed grammar
Jan
30
asked Matrix with maximal rank in a family of matrices
Jan
26
comment Determining the convergence of $\sum (-1)^{k-1} \frac{\log k}{\sqrt{k}}$ and a more complicated series
For $ k > 1, \log k > 0,$ and $$k = \exp \log k = 1 + \frac{\log k}{1} + \frac{(\log k)^2}{2!} + \frac{ (\log k)^3}{3!} + \dots +$$, so, $(\log k)^3/6 \leq k$ and $ \log k \leq \sqrt[3]{6k}.$
Jan
25
accepted Invariant subspace of an orthogonal operator.
Jan
24
comment Invariant subspace of an orthogonal operator.
This is neat. Thanks!
Jan
24
revised Invariant subspace of an orthogonal operator.
deleted some unecessary lines.
Jan
24
comment Invariant subspace of an orthogonal operator.
I will update the questions with the original argument, reference, and how I came up with this question from his argument shortly.
Jan
24
comment Invariant subspace of an orthogonal operator.
I have removed all references to argmax.
Jan
24
revised Invariant subspace of an orthogonal operator.
made sure $x_0$ is defined unambiguously
Jan
24
comment Invariant subspace of an orthogonal operator.
It is a $x_0$ with $\|x_0\|=1$ which maximizes $ x^TAx$ over $\{x:\|x\|=1\}.$
Jan
24
asked Invariant subspace of an orthogonal operator.
Jan
23
revised Set of Discontinuities for a function $f$
Changing $ env to $$ environment to make the answer render better. It was not rendering correctly on my laptop.