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comment Research done by high-school students
@vzn Sure, "elementary" problems often lead to good mathematics. I'm not disputing that. What I am disputing is that solving problems for a math contest counts as research. Finding this "Vieta jumping" solution was a great mathematical feat, but it was not research.
Jan
25
answered Why is $\lim_{n \to +\infty }{\sqrt[n]{a_1 a_2 \ldots a_n}} = \lim_{n \to +\infty}{a_n}$
Jan
25
comment Is Problem Solving Strategies by Engel sufficient?
Sounds like a good plan. I doubt the choice of book matters too much. (Though if you're starting out, perhaps Problem Solving Through Problems by Larson would be easier to get through.)
Jan
25
comment Is Problem Solving Strategies by Engel sufficient?
I'm skeptical one book will teach you all you need to know for the Putnan exam. You really just need to practice, practice, practice. Books are necessary but not sufficient.
Jan
25
comment Is Problem Solving Strategies by Engel sufficient?
No. But you have to start somewhere.
Jan
20
comment Find all matrices where the matrix is its own inverse and the determinant is 1
I enjoyed this answer.
Jan
14
comment Deriving probability of exactly one event occuring
This answer is entirely correct, but at the same time, I can't believe that anyone familiar with measure theory would be asking this question.
Jan
12
comment Compute $f^{(22)}(0)$ where $f(x)= \sin(x)/x$ if $x\neq0$ and $1$ if $x=0.$
Wonderful. $ $ $ $
Jan
12
comment Rational matrix having roots of every degree
@loupblanc Could you provide a proof, or a reference to one?
Jan
12
revised Rational matrix having roots of every degree
added 47 characters in body
Jan
12
asked Rational matrix having roots of every degree
Jan
9
awarded  Popular Question
Jan
4
comment Prove a certain property of linear functionals, using the Hahn-Banach-Separation theorems
Please don't deface your posts.
Jan
4
revised Prove a certain property of linear functionals, using the Hahn-Banach-Separation theorems
rolled back to a previous revision
Dec
25
comment Rao-Blackwell Theorem - Best estimator (Statistics)
I rolled back the edit because it gave the wrong expression for the estimator.
Dec
25
revised Rao-Blackwell Theorem - Best estimator (Statistics)
rolled back to a previous revision
Dec
25
comment Rao-Blackwell Theorem - Best estimator (Statistics)
My answer below sketches how I would do it. Perhaps there is a simpler way I am missing.
Dec
25
answered Rao-Blackwell Theorem - Best estimator (Statistics)
Dec
25
comment Rao-Blackwell Theorem - Best estimator (Statistics)
Do you know the Lehmann-Scheffe theorem?
Dec
20
awarded  Constituent