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1h
reviewed Close Proving $\sum_{i=1}^n 2^i = 2^{n+1} - 2$ using strong induction
1h
reviewed Reviewed Center of gravity of a hollow or solid semi sphere
1h
comment Center of gravity of a hollow or solid semi sphere
Welcome to Math.SE! While help with mathematics is available at all levels of skill, it is expected that Community participants will give their best efforts to contribute solid content. Please edit the Question to improve the spelling and capitalization, and while you are editing, include what you've tried and what difficulty you encountered.
4h
comment Algorithm to answer existential questions - Reduction
If you are asking about a published paper, it would be helpful to have a citation to it. It seems that you have quoted a bunch of "results", only to ask how those lead to some conclusion about "existential questions in $\mathbb{Z}$."
8h
reviewed Close What is unit ball in the weak star topology of a Banach space?
8h
comment Least squares optimization problem, KKT conditions and derive expression for $x^*$
Please do not deface your Question with such radical edit as to make it unintelligible.
8h
revised Least squares optimization problem, KKT conditions and derive expression for $x^*$
rolled back to a previous revision
8h
reviewed Looks OK Does anyone know when I would use this symbol ($\supseteqq$) and meaning?
8h
reviewed Reviewed Number of different keyboard layouts?
8h
comment Number of different keyboard layouts?
So $30!$ is clearly correct, almost the definition of the number of permutations of thirty things. Are you asking about the numerical value being correct?
8h
reviewed Reject Evaluations of a Definite Integral with cosine function
8h
comment Is there a numerical solution for a system of three 1st order nonlinear ODE?
I'm having to guess at how this answers the Question ("is there a numerical solution for..."). If you are proposing to solve numerically the higher-order ODE show above for $x$, rather solving the system of first-order ODEs, this would be an intelligible approach. However you should say this is what you mean, and argue (if possible) why you think the numerical solution is better done this way. If nothing else such an Answer could highlight the "missing" initial condition already noted in the Comments on the Question itself.
10h
comment Why is it that the product of first N prime numbers + 1 another prime?
To be concrete, $2⋅3⋅5⋅7⋅11⋅13+1 = 59\cdot 509$ is not a prime.
10h
comment Why is it that the product of first N prime numbers + 1 another prime?
It is not the case that the product of the first $N$ primes + 1 is another prime, only that it contains a novel prime factor.
11h
comment What are some tricks to solve Progressions quickly?
While arithmetic and geometric series ("progressions" understood as finite sums) have convenient closed forms, this is not something that can be generalized without qualification. Your adjuration to "add the first 3-4 given elements of the series" would seem helpful only for series that are rapidly converging, as the $n$th places might take us far away from that starting segment.
11h
comment Why is reflection in a plane an automorphism?
Dr. Weyl's book Symmetry (Princeton, 1952) is a popularizing work. Quoting from the preface: "This book is semi-popular in character. It does not shun mathematics, but detailed treatment of most of the problems it deals with is beyond its scope."
14h
comment Why is reflection in a plane an automorphism?
@AlexR : Thanks for this. It's true that if we want to preserve vector space structure, then the plane of reflection needs to be a subspace, i.e. to pass through the origin. But I didn't want to bring up those structures of space not preserved by reflection, as for example coordinates are not preserved.
15h
awarded  Popular Question
15h
answered Why is reflection in a plane an automorphism?
1d
reviewed Looks OK Hot dog combinatorics