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Christian Blatter

Switzerland

math.ethz.ch/~blatter

Age: 77

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Top Questions
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Top Answers
27
Is 1100 a valid state for this machine?
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24
Nice expression for minimum of three variables?
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22
Connection between fourier transform and taylor series
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21
Intuitive interpretation of the Laplacian
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18
What is a hexagon?
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17
What is the importance of the Collatz conjecture?
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16
Nice proofs of $\zeta(4) = \pi^4/90$?
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16
On a topological proof of the infinitude of prime numbers.
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15
Two squares in a box.
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13
Is there a rational number (with denominator not greater than 200) between 15/106 and 16/113?
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13
What is the volume of $\{ (x,y,z) \in \mathbb{R}^3_{\geq 0} |\; \sqrt{x} + \sqrt{y} + \sqrt{z} \leq 1 \}$?
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13
A way to see that $\int_{0}^{\infty}\exp(-x)dx=1$?
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13
Proof: If $f'=0$ then is $f$ is constant
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13
Representing the multiplication of two numbers on the real line
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11
Olympiad calculus problem
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11
If $f(0)=0$ and $f'$ is increasing, then $\frac{f(x)}{x}$ is increasing.
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11
Appropriate Notation: $\equiv$ versus $:=$
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11
Solving 4 unknown angles in quadrilateral possible?
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11
How to show $(1/n!)^{1/n}$ goes to $0$ as $n$ goes to infinity?
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10
Why do 4 circles cover the surface of a sphere?
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10
Is Fourier Series an “Inverse” of Taylor Series
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10
How can I prove Infinitesimal Limit
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10
A problem about floor function
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9
Is there an analytic approximation to the minimum function?
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9
What do Algebra and Calculus mean?
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9
$(0,1)\to\mathbb{R}^2$ injective, continuous, not a homeomorphism on the image
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9
Solving the differential equation $\frac{dy}{dx}=\frac{3x+4y+7}{x-2y-11}$
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8
Similar matrices have the same eigenvalues with the same geometric multiplicity
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8
Mapping Irregular Quadrilateral to a Rectangle
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8
Solving $x^3-y^3=xy+61$
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