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Christian Blatter

ETH Zurich (Switzerland)

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

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Top Questions
Top Answers
147
Connection between Fourier transform and Taylor series
math.stackexchange.com

134
Intuitive interpretation of the Laplacian Operator
math.stackexchange.com

96
20 circles in the plane, all passing through the origin
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87
Is there a clever solution to Arnold's "merchant problem"?
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72
What should be the intuition when working with compactness?
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64
What does the term "undefined" actually mean?
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60
Is math built on assumptions?
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50
Is there a vector space that cannot be an inner product space?
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50
Examples of using physical intuition to solve math problems
mathoverflow.net

49
New Idea to prove $1+2x+3x^2+\cdots=(1-x)^{-2}$
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47
What is the limit of $n \sin (2 \pi \cdot e \cdot n!)$ as $n$ goes to infinity?
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45
Nice proofs of $\zeta(4) = \frac{\pi^4}{90}$?
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45
Representing the multiplication of two numbers on the real line
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45
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

44
Determine whether $f(x)={\sin x \over x}$ is uniformly continuous in $\mathbb R$
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43
Is 1100 a valid state for this machine?
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42
What is the importance of the Collatz conjecture?
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41
Do there exist pairs of distinct real numbers whose arithmetic, geometric and harmonic means are all integers?
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39
Is there any way to define arithmetical multiplication as other thing than repeated addition?
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38
Nice expression for minimum of three variables?
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37
Appropriate Notation: $\equiv$ versus $:=$
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36
Function satisfying $f^{-1} =f'$
mathoverflow.net

35
Prove that $\sqrt{7}^{\sqrt{8}}>\sqrt{8}^{\sqrt{7}}$
math.stackexchange.com

34
Why do units (from physics) behave like numbers?
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33
Is there an elegant bijective proof of $\binom{15}{5}=\binom{14}{6}$?
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33
The number $2^{29}$ has exactly $9$ distinct digits. Which digit is missing?
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32
Mean Value Theorem for complex functions?
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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
Show that the equation $\cos(\sin x)=\sin(\cos x)$ has no real solutions.
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31
Why is the Möbius strip not orientable?
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