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klirk
  • Member for 5 years, 8 months
  • Last seen more than a month ago
25 votes

Are there any two numbers such that multiplying them together is the same as putting their digits next to each other?

12 votes
Accepted

How to interpret a sum with two indices?

8 votes
Accepted

Why integral curves cannot be tangent to each other?

7 votes
Accepted

The sum of 8 consecutive Fibonacci numbers is not a Fibonacci number

6 votes
Accepted

Is a linear map (transformation) always a matrix multiplication

6 votes
Accepted

Find roots of a complex quadratic equation having one purely imaginary root

6 votes

The 1st term is $\frac{1}{a}$, 2nd term is $\frac{1}{a+d}$, 3rd term is $\frac{1}{a+2d}$. Find the 5th term of the sequence?

5 votes
Accepted

$ \langle\Delta_\partial\omega,\omega\rangle = || \partial \omega||^2 + ||\partial^*\omega||^2 $ on compact Kahler manifold

5 votes
Accepted

Riesz Representation Theorem - converse true?

4 votes
Accepted

closed forms on a closed oriented surface

4 votes
Accepted

de Rham cohomology of doubly punctured torus

4 votes
Accepted

Is a sequential compact set bounded in $\mathbb{R}^n$?

3 votes
Accepted

is there a one equation curves that describe multiples curves?

3 votes
Accepted

$i: (D^n,S^{n-1}) \mapsto (D^n,D^n\setminus \{0\})$ is not a homotopy equivalence of pairs

3 votes
Accepted

My own proof of $1/n^2$ converges and therefore it is Cauchy.

3 votes
Accepted

Divisor effective on compact Riemann surface

3 votes
Accepted

How to apply the cellular boundary formula?

3 votes

Trouble understanding null-homotopic chain maps

3 votes
Accepted

Finding limit of $\frac{\tan{x}-\sin{x}}{x^3}$.

3 votes
Accepted

Why proof by contradiction here?

3 votes
Accepted

Differentiability of $f$ if $f = \sum f_k$ and $f_k$ are differentiable at one point

2 votes

Does There exist a bijection between $\mathbb{R}^2$ and $ \mathbb{R}$ such that it is differentiable

2 votes

Is it always possible to take $H$ such that $\phi_1$ is injective?

2 votes
Accepted

Prove that $|\phi|^2 = \lambda$, where $\lambda$ is the largest eigenvalue of the selfadjoint mapping $\bar \phi \circ \phi$.

2 votes
Accepted

How to evaluate this trigonometric integral?

2 votes

Difference of cohomologous Kähler forms

2 votes
Accepted

American call option is a submartingale

2 votes
Accepted

What does $x-a$ do in Taylor series?

2 votes

How would I show that X is equivalent to ((¬X ↔ X ) ∨ X )?

2 votes

Silly question on trigonometry