Dominic Michaelis

Germany

http://www.facebook.com/dominic.michaelis.3

I study physics at the "Technische Universität Darmstadt", but I spend most time doing math. My favorite topics are Topology and Algebra, even though my knowledge there is strictly limited.

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Nice examples of groups which are not obviously groups

abstract-algebra group-theory examples-counterexamples big-list asked Apr 15, 2013 at 15:02

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52 votes

Is every function with the intermediate value property a derivative?

real-analysis examples-counterexamples asked Mar 11, 2013 at 7:24

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34 votes

Finding Limits in several variables

functions calculus-and-analysis asked Mar 17, 2013 at 19:36

mathematica.stackexchange.com

25 votes

Showing a filter on the Power set of $\mathbb{Z}$ is a one point Filter

general-topology set-theory filters asked Apr 27, 2013 at 16:08

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18 votes

Difference of perp and bot

symbols relation-symbols asked Mar 12, 2013 at 20:59

tex.stackexchange.com

17 votes

Does $\sin(x)=y$ have a solution in $\mathbb{Q}$ beside $x=y=0$

number-theory irrational-numbers transcendental-numbers asked Feb 16, 2013 at 6:06

math.stackexchange.com

16 votes

Is there an $n^{\text{th}}$ root function in Mathematica?

functions asked Mar 12, 2013 at 12:56

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13 votes

Arrow parallel to a line with TikZ

tikz-pgf asked Mar 1, 2013 at 14:09

tex.stackexchange.com

12 votes

How to have a common height of subscripts when some got superscripts too?

subscripts asked Apr 14, 2013 at 9:28

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11 votes

Whats the connection between functions with curl 0 and holomorphic functions

complex-analysis reference-request intuition vector-analysis asked Apr 5, 2013 at 14:54

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Top Answers

Critiques on proof showing $\sqrt{12}$ is irrational.

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How to prove $\det \left(e^A\right) = e^{\operatorname{tr}(A)}$?

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Find $\lim_{n \to \infty}\frac{\sin 1+2\sin \frac{1}{2}+\cdots+n\sin \frac{1}{n}}{n}$

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Could I be using proof by contradiction too much?

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Why can the intersection of infinite open sets be closed?

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How do I show that a matrix is injective?

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Difference between the Laurent and Taylor Series.

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How to determine the exact value of $\sin(585^\circ)$?

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Is there a short proof for the Intermediate Value Theorem

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The series $\sum_{n=1}^{+\infty}\frac{1}{1^2+2^2+\cdots+n^2}.$

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A symmetric matrix whose square is zero

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Why is it important to have a discrepancy between image and codomain?

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Why metric space is topological space and examples of non-Hausdorff spaces

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Difference between $\mathbb C$ and $\mathbb R^2$

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Does a function exist with the property $f(-n^2+3n+1)=(f(n))^2+1$?

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Radius of convergence of a sum of power series

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Is there an $n^{\text{th}}$ root function in Mathematica?

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How to prove that $\lim\limits_{n\to\infty} \frac{n!}{n^2}$ diverges to infinity?

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Prove $3|n(n+1)(n+2)$ by induction

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Examples of non-cyclic group with a cyclic automorphism group

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What is the property that allows $5^{2x+1} = 5^2$ to become $2x+1 = 2$?

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how to prove that$\sum_{n=1}^{\infty}{ n^4\over n!}=15e$

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Example of a set $Y$ that has zero Lebesgue measure and a continuous function $f$ such that $f(Y)$ is not a set of zero Lebesgue measure.

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Where are the values of the sine function coming from?

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Determinant of matrix exponential?

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$xy=1 \implies $minimum $x+y=$?

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If $f$ is analytic where $f$ is represented as $f=g.h$ where $g$ is analytic . From here can we conclude that $h$ is analytic?

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Diagonalizable upper triangular matrices

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How to evaluate $\sum\limits_{n=1}^{+\infty}\frac{1}{1^k+2^k+\cdots+n^k}$?

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composition of continuous functions

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