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Christian Blatter

ETH Zurich (Switzerland)

http://www.math.ethz.ch/~blatter

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Top Questions
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131
Connection between Fourier transform and Taylor series
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108
Intuitive interpretation of the Laplacian
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95
20 circles in the plane, all passing through the origin
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60
What does the term “undefined” actually mean?
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59
Is math built on assumptions?
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57
What should be the intuition when working with compactness?
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49
Examples of using physical intuition to solve math problems
mathoverflow.net

47
New Idea to prove $1+2x+3x^2+\cdots=(1-x)^{-2}$
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43
Nice proofs of $\zeta(4) = \frac{\pi^4}{90}$?
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42
Is 1100 a valid state for this machine?
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40
Do there exist pairs of distinct real numbers whose arithmetic, geometric and harmonic means are all integers?
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39
What is the importance of the Collatz conjecture?
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39
Is there any way to define arithmetical multiplication as other thing than repeated addition?
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38
What is the limit of $n \sin (2 \pi \cdot e \cdot n!)$ as $n$ goes to infinity?
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38
Determine whether $f(x)={\sin x \over x}$ is uniformly continuous in $\mathbb R$
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37
Is there a vector space that cannot be an inner product space?
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37
Representing the multiplication of two numbers on the real line
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36
Nice expression for minimum of three variables?
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33
The number $2^{29}$ has exactly $9$ distinct digits. Which digit is missing?
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33
Why do units (from physics) behave like numbers?
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33
Function satisfying $f^{-1} =f'$
mathoverflow.net

32
6 women and 4 men wait in line. If their order in line is random, find the probability that all of the women are adjacent to one another.
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31
Is there an elegant bijective proof of $\binom{15}{5}=\binom{14}{6}$?
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30
About interesting numbers
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29
Why does a distance and its square reach their minimum at the same point?
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29
Recovering a quadratic polynomial from three values using calculus
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29
Prove that $\sqrt{7}^{\sqrt{8}}>\sqrt{8}^{\sqrt{7}}$
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28
If you break a stick at two points chosen uniformly, the probability the three resulting sticks form a triangle is 1/4. Is there a nice proof of this?
mathoverflow.net

27
Double Integral $\int\limits_0^b\int\limits_0^x\sqrt{a^2-x^2-y^2}\,dy\,dx$
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27
Appropriate Notation: $\equiv$ versus $:=$
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