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9h
revised Is a separable Hilbert space spanned by a countably dense subset?
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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 $12$?
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11h
revised Finding the maximum of two functions with complicated formulas
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11h
revised taking the limit $\lim\limits_{n\rightarrow \infty} {\frac{(3^{n+1} + 4)(7^n-47)}{(7^{n+1}-47)(3^n +4)} }$
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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
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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 $\mathbb R^n$
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19h
revised How is the degree of a polynomial defined? $a_1+a_2x^2+\cdots+a_nx^{n-1}$ has degree $n$ or $n-1$?
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19h
revised Integrating $\frac{1}{1+z}$ along a path to derive the Maclaurin series for $\mathrm{Log}(1+z)$
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19h
revised Prove that $\sinh(\cosh(x)) \geq \cosh(\sinh(x))$
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