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12041
bio website jungenschaft-hohenstaufen.de
location Berlin, Germany
age 33
visits member for 2 years, 10 months
seen 3 hours ago

Dec
11
revised Approximating bounded operators in Hilbert space
added 623 characters in body
Dec
11
answered Approximating bounded operators in Hilbert space
Dec
11
revised Two Real Analysis Questions
TeXification
Dec
10
reviewed Edit Show that $ 2(a^2 b^2+a^2c^2+b^2c^2)-(a^4+b^4+c^4) = (a+b+c)(-a+b+c)(a-b+c)(a+b-c) $
Dec
10
revised Show that $ 2(a^2 b^2+a^2c^2+b^2c^2)-(a^4+b^4+c^4) = (a+b+c)(-a+b+c)(a-b+c)(a+b-c) $
TeXification
Dec
10
answered Calculating the dimension of a vector space in 2 different ways
Dec
10
reviewed Reviewed Trisect unknown angle using pencil, straight edge & compass; Prove validity of technique
Dec
10
comment Trisect unknown angle using pencil, straight edge & compass; Prove validity of technique
But the question asks to perform an exact trisection!
Dec
10
answered The Differentiability of $f$ in $\mathbb R^2$
Dec
10
answered What is generally the strategy for converting recurrence to closed form?
Dec
10
revised What is generally the strategy for converting recurrence to closed form?
TeXification
Dec
10
comment Symmetric bounded linear maps can be approximated by compact symmetric linear maps.
For (a): Didn't you write in your assumption on $P$ that you want to have $P' = P$? Where is your point? For (b): Let $(e_n)_{n\in\mathbb N}$ an orthogonal basis for $H$. Such a thing exists, as $H$ is seperable. Now let $P_n$ denote the orthogonal projection onto $\operatorname{span} \{e_1, \ldots, e_n\}$ and $C_n := P_nTP_n$. Then $C_n$ is symmetric by (a) and compact by finite-dimensionality.
Dec
10
comment Recurrence with cases
Please use $...$ for mathematical text.
Dec
10
revised How can I prove that every group of $N = 255$ elements is commutative?
TeXification
Dec
10
comment Recurrence with cases
What did you mean by $f \in \langle 0, 1 \rangle$? I replaced it with $f \in (0,1)$, was that right?
Dec
10
revised Recurrence with cases
TeXification
Dec
10
answered Differentiability and extrema - counterexamples for a few statements
Dec
10
revised Prove that every element of $a_{n+2013}=\frac{a_{n+1}a_{n+2}…a_{n+2012}+1}{a_n}$ is an integer
edited tags
Dec
10
answered Procedures to find solution to $a_1x_1+\cdots+a_nx_n = 0$
Dec
10
answered Determinant of anti-diagonal permutation matrix