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Alvis Nordkovich
  • Member for 4 years, 7 months
  • Last seen more than a month ago
3 votes
Accepted

I need help solving a competition math problem.

2 votes
Accepted

Simplify ((A ∪ B) ∩ C) ∪ ((C − A) − B).

2 votes

Why the neighborhood is a topological space?

1 vote
Accepted

Prove that there exists a subspace $W'$ and a function $T : V\to V$ such that $T$ is a projection on $W$ along $W'$.

1 vote

Need help to understand a solution to a polynomial problem.

1 vote

Reasons behind Assumptions to Simplify Inverse Trigonometric Functions

1 vote

Isomorphisms and Linear Maps

1 vote

Showing that the Intermediate Value Theorem is false in the absence of irrational numbers

1 vote

Having trouble following the logic of this proof

1 vote

Show that $61!+1$ is divisible by $71$

1 vote

Problems on subspace topology and basis for a topology

0 votes

Prove that this function is not integrable: $f(x)$ is $1-x$ for $x$ rational, and $1/x$ for $x$ irrational

0 votes

Prove that there exists $b \in B$ that is an upper bound for $A$

0 votes

Power series $f(x)=\frac1{(1+x)^2}$

0 votes

$\lim\limits_{(x,y) \rightarrow (0,0)}\frac{xy}{x^2 + y^2}$

0 votes
Accepted

An estimate in the proof of $Q(t)x = \lim_{\epsilon \rightarrow 0} \exp(tA_\epsilon)x$ for semigroup of operators.