celtschk

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seen Oct 26 '12 at 6:50
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85 Answers

newest activity votes
80
How to tell $i$ from $-i$?
45
Are all infinities equal?
17
What are imaginary numbers?
15
A field without a canonical square root of $-1$
13
A nontrivial subgroup of $G$ contained in every other nontrivial subgroup.
8
Proof that determinant rank equals row/column rank
8
Why this proof $0=1$ is wrong?(breakfast joke)
8
Cardinality of a union of uncountable and countable set.
7
why 0=0 is not possible??
6
Please could someone explain what P(A $\cup$ B) means? and how you know what its out of?
6
Hermitian/positive definite matrices and their analogues in complex numbers
5
In a polynomial of $n$ degree, what numbers can fill the $n$?
5
Is there a good description of the series $\sum_{j=0}^{n}a^j b^{n-j}$?
5
what is $c$ in Mandelbrot set?
5
Cute trigonometric triviality
4
What is the difference between an array and a vector?
4
Analogy of Binary subtraction to decimal subtraction
4
What does mantissa mean here?
4
What are some classic fallacious proofs?
4
The greatest possible geometric multiplicity of an eigenvalue
4
Proving the trace of a transformation is independent of the basis chosen
3
Proof of derivative of $e^x$ is $e^x$ without using chain rule
3
Proof: Symmetric and Positive Definite
3
Is $y(t) = t^2 + i\cdot t^2$ a periodic function?
3
Permutations: 10 bins, 20 objects
3
Confusion with partial fractions integration of $\frac{1}{1+x^2}$
3
What are the Eigenvectors of the curl operator?
3
Is this 3D curve a circle?
3
Question about swindler-writer
3
Find the probability of three tosses of a fair coin
1 2 3