Jonas Meyer
Reputation
96/100 score
 9h revised Is a separable Hilbert space spanned by a countably dense subset? edited title 10h revised Proving each automorphism of a group $G$ fixes a normal subgroup of order $p^n$ if $p\nmid\frac{|G|}{p^n}$ descriptive title 11h revised Rolling two dice, what is the probability that two consecutive $7$s happens earlier than a $12$? edited title 11h revised Finding the maximum of two functions with complicated formulas edited title 11h revised taking the limit $\lim\limits_{n\rightarrow \infty} {\frac{(3^{n+1} + 4)(7^n-47)}{(7^{n+1}-47)(3^n +4)} }$ edited title 11h revised For a function $f:S\to S$, if $f$ is injective, then $f\circ f\circ f$ is injective descriptive title 11h revised Describe in words the product of the adjacency matrices for $G^3$ and $G^4$ descriptive title 11h revised If there is a finite-closed topology on $X$ with 3 clopen elements, then $X$ is finite edited title 11h reviewed Close If $\int_a^b \left |{f^{\prime}}\right |=V\left. [ a,b \right ]$, $f$ of bounded variation, then $f$ absolutely continuous. 11h comment Excel Exponential Line Values What is a period? 12h revised Hydrostatic pressure on a triangle deleted 66 characters in body 12h reviewed Leave Open Sum of two independent Continuous-Time Markov Chains 13h comment Rouche Theorem and applications "I think $f$ maybe one to one since the kernel maybe the zero element" reflects a lot of confusion. (1) $f$ is not a linear transformation or homomorphism between groups, so what do you mean by "kernel"? (2) If you meant the set $\{z: f(z) = 0\}$, having that set equal $\{0\}$ does not imply that $f$ is injective. 13h reviewed Close Revised proof for the set of positive irrational numbers closed under multiplication* 19h comment Continuous convergence There are problems with the statement. You are missing a limit, but also missing hypotheses, as it is easy to come up with counterexamples. 19h comment Question about Measure Theory Please consider giving more descriptive titles. "Question" is always redundant, and "measure theory" is already a tag, so your title can instead indicate what your question is. 19h revised Finding orthogonal projections onto $1$ (co)-dimensional subspaces of $\mathbb R^n$ descriptive title 19h revised How is the degree of a polynomial defined? $a_1+a_2x^2+\cdots+a_nx^{n-1}$ has degree $n$ or $n-1$? edited title 19h revised Integrating $\frac{1}{1+z}$ along a path to derive the Maclaurin series for $\mathrm{Log}(1+z)$ descriptive title 19h revised Prove that $\sinh(\cosh(x)) \geq \cosh(\sinh(x))$ edited title