93,939 reputation
582173
bio website von-eitzen.de/math/tntrep.xml
location Bonn, Germany
age 48
visits member for 1 year, 7 months
seen 46 mins ago

I did study math and had a knack for it, but I am sooo out of that business now ...


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answered Mapping a distorted ellipse onto a circle
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answered Showing that $38^n+31$ is prime
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comment Showing the boundary of set has measure zero
... and the graph $y=x$ and the graph $y=x^2$ (and you need only $x=0$, $x=1$, $z=0$ as parts of $\partial Q$)
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answered Showing the boundary of set has measure zero
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answered Which average to use with range
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answered Show that $x_0$ must be an integer. Conclude that $\sqrt[n]{2}$ is irrational for every $n \geq 2$
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revised Show that $x_0$ must be an integer. Conclude that $\sqrt[n]{2}$ is irrational for every $n \geq 2$
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awarded  Nice Answer
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comment Let G be a finite abelian group. Let p be a prime number.
(i) is not true. Consider the trivial group.
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comment How can you proof that the sum of three roots is irrational?
But watch out: $\sqrt 2+\sqrt{8}-\sqrt{18}$ is rational!
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comment Is Douglas Hofstadter's version of Godel's proof utter nonsense?
Once I had solved tha "b is a power of $10$" problem, I was able to produce an explicit Gödel-like statment (though the fun part was rather tp write a program that helped expnd high-level predicates). So I'm prettty sure the book conveys the idea good enough, even if ther should be minor errors (which I do not remember to even have suspected)
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comment Is Douglas Hofstadter's version of Godel's proof utter nonsense?
Well, per arithmoquinification, it is, IIRC
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answered Summation with non integer induces
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revised How to show a sequence converges
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revised How to show a sequence converges
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answered How to show a sequence converges
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answered Why are rectangular cartograms hard to generate?
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comment Geographic representation of summations and floors
The sums can be viewed as counting lattice points below / above the diagonal in an $a\times b$ rectangle
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answered Is there exist a linear map $T:\mathbb{R^2}\to\mathbb{R^3}$ such that $Range(T)=\{(x_1,x_2,x_3)∈ \mathbb{R}:x_1 + x_2 + x_3 = 0\}$?
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answered Find the distance traveled by the particle during the given time interval.