There are many different types of numbers, some of which you may remember from school: natural, rational, irrational, imaginary, calculable and incalculable numbers. Today, however, we are going to ...

What is your favorite number? For many people, it may be an irrational number such as pi (π), Euler’s number (e) or the square root of 2. Even among the natural numbers (positive integers), there are ...

Infinite sets $P$ and $Q$ of primes are described, $P \subset Q$. For any natural number $n$ it can be decided if $n \in P$ in (deterministic) time $O((\log n)^9 ...

For each natural number n, an example of a finite dimensional algebra Λ n is given, which has left little finitistic dimension equal to 1 and left big finitistic dimension equal to n.