Stack Exchange

Stefan Geschke

Bonn, Germany

hcm.uni-bonn.de/homepages/prof-dr-stefan-geschke

Age: 42

I am a math professor at the Hausdorff Center for Mathematics in Bonn. Most of my work is in Set Theory of the reals and Boolean algebras.

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Top Questions
Top Answers
32
What is the cardinality of the set of all topologies on $\mathbb{R}$?
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16
Why Euclidean geometry cannot be proved incomplete by Gödel's incompleteness theorems?
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15
True vs. Provable
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13
How do you pronounce the inverse of the $\in$ relation? How do you say $G\ni x$?
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10
first countable $\Leftrightarrow$ compact and Hausdorff?
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9
A non-arithmetical set?
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9
Proof that convex open sets in $\mathbb{R}^n$ are homeomorphic?
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7
Is $\mathbb{R}$ the only ordered field?
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7
How it is possible that sound system is inconsistent
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6
Axiom schema and the definition of natural numbers
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6
Motivation for Topology study in Real Analysis
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6
measure theory - cantor set
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5
Unions and intersections simplification ran into dead end
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5
How can you construct a topology from a fundamental system of neighborhoods?
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5
Prove by delta/epsilon that $\lim_{x \to \infty}{\frac{x}{1+x^2}} = 0$
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5
How many countable models of ZFC are there?
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5
How to show that $0 \times 2 = 0$?
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5
Aftermath of the incompletness theorem proof
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5
When is there in a probability space no null sets?
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5
On the Volume of Compact matrix Lie groups
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5
Intersection of compact and discrete subsets
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5
What is the isomorphism between $\wedge^n(V)$ and $\mathbb{R}$?
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