Yeldarbskich's user avatar
Yeldarbskich's user avatar
Yeldarbskich's user avatar
Yeldarbskich
  • Member for 9 years, 7 months
  • Last seen more than 3 years ago
  • North Carolina, United States
42 votes
Accepted

distance from a point to a hyperplane

6 votes
Accepted

Show that the number $z=\sqrt[3]{4}-2i$ is algebraic, that is satisfied a polynomial equation with integer coefficients.

4 votes

closure = union of the set and the set of limit points

4 votes
Accepted

Is supremum part of the set or it is the bigest element out of it?

3 votes
Accepted

A standard Operations on sets.

3 votes

Finding the dimension of and a basis for $\text{Hom}_K(U, V)$

3 votes

Proving the nested interval theorem

3 votes

Difference between direct sum and Cartesian product in terms of finite dimensional vector spaces.

2 votes
Accepted

Understanding example 2.36 in Hatcher's Algebraic Topology (calculating homology groups)

2 votes

How can I prove that $e^x \cdot e^{-x}=1$ using Taylor series?

2 votes
Accepted

Using Lagrange multipliers, find the maximum value of a square root

2 votes

How to prove all epics are retractions?

2 votes
Accepted

Interesting areas of study in point-set topology

2 votes
Accepted

proving that an equation $\frac{f}{g} $ is uniformly continous

1 vote

How to solve a system of three nonlinear equation in a simple way

1 vote
Accepted

General Topology, Bounded set related to point of accumulation

1 vote

Proving $f: A \to R$ is continuous at $a \in A$ knowing $(a − \delta', a + \delta') \subset A$ for some $\delta' > 0$

1 vote

Prove that $\int_a^b f(x)dx=\int_{\alpha}^{\beta}f(\varphi(y))\varphi'(y)dy$

1 vote
Accepted

Relations between upper and lower Riemann sum

1 vote

$G$-sets, natural correspondence?

1 vote
Accepted

Solutions to Munkres 53 2 that don't make sense to me

1 vote

Prove that lebesgue integrable equal lebesgue measure

1 vote
Accepted

Generating set of the image of fundamental group of a covering space

1 vote
Accepted

Continuity of $v: \mathcal{B} (M;N) \times M \rightarrow N$, $v(f,x) = f(x)$.

0 votes

How to check if the following are isomorphism?

0 votes

Prove that if P is idempotent a $I- \lambda P$ is invertible

0 votes

Is it always possible to find a vector, result from the sum of 2 elements of 2 different subspaces, which is not in the union of them?

0 votes
Accepted

How to prove a Functor has a left adjoint?

0 votes

Directional derivative of $f=f(\nabla \cdot\mathbf{u})$