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Christian Blatter's user avatar
Christian Blatter's user avatar
Christian Blatter's user avatar
Christian Blatter
  • Member for 13 years, 10 months
  • Last seen more than 3 years ago
161 votes
Accepted

Connection between Fourier transform and Taylor series

153 votes
Accepted

Intuitive interpretation of the Laplacian Operator

100 votes

20 circles in the plane, all passing through the origin

92 votes

Is there a clever solution to Arnold's "merchant problem"?

80 votes

What should be the intuition when working with compactness?

66 votes

What does the term "undefined" actually mean?

61 votes

Is math built on assumptions?

58 votes

Is there a vector space that cannot be an inner product space?

52 votes

New Idea to prove $1+2x+3x^2+\cdots=(1-x)^{-2}$

50 votes
Accepted

Representing the multiplication of two numbers on the real line

50 votes

What is the limit of $n \sin (2 \pi \cdot e \cdot n!)$ as $n$ goes to infinity?

49 votes
Accepted

Appropriate Notation: $\equiv$ versus $:=$

49 votes
Accepted

What is the remainder when $6^{273} + 8^{273}$ is divided by $49$?

46 votes

Nice proofs of $\zeta(4) = \frac{\pi^4}{90}$?

46 votes

Determine whether $f(x)={\sin x \over x}$ is uniformly continuous in $\mathbb R$

44 votes

What is the importance of the Collatz conjecture?

43 votes
Accepted

Is 1100 a valid state for this machine?

41 votes

Nice expression for minimum of three variables?

41 votes

Do there exist pairs of distinct real numbers whose arithmetic, geometric and harmonic means are all integers?

39 votes

Is there any way to define arithmetical multiplication as other thing than repeated addition?

36 votes
Accepted

Formal basis for variable substitution in limits

36 votes
Accepted

Mean Value Theorem for complex functions?

35 votes
Accepted

Prove that $\sqrt{7}^{\sqrt{8}}>\sqrt{8}^{\sqrt{7}}$

35 votes

Why do units (from physics) behave like numbers?

34 votes
Accepted

Every harmonic function is the real part of a holomorphic function

33 votes

Why is the Möbius strip not orientable?

33 votes

What is the exact and precise definition of an ANGLE?

33 votes

The number $2^{29}$ has exactly $9$ distinct digits. Which digit is missing?

33 votes

Is there an elegant bijective proof of $\binom{15}{5}=\binom{14}{6}$?

32 votes
Accepted

$6$ 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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