The Riemann hypothesis is a mathematical conjecture. Many people think that finding a proof of the hypothesis is one of the hardest and most important unsolved problems ... -->

This web site is the amusing side of the algebra, a rich branch of mathematics. Algebra is useful in many fields from everyday life to technical fields.

In number theory, a weird number is a natural number that is abundant but not semiperfect. In other words, the sum of the proper divisors (divisors including 1 but not itself) ... -->

The angel problem is a question in game theory proposed by John Horton Conway. The game is commonly referred to as the Angels and Devils game. The game ... -->

In linear algebra, Cramer's rule is an explicit formula for the solution of a system of linear equations with as many equations as unknowns, valid ... -->

In number theory, Polignac's conjecture was made by Alphonse de Polignac in 1849 and states:
For any positive even number n, there are infinitely many prime gaps of size n. In ... -->

In hyperbolic geometry, the angle of parallelism φ, also known as Π(p), is the angle at one vertex of a right hyperbolic triangle that has two asymptotic parallel sides. ... -->

Hilbert's 16th problem was posed by David Hilbert at the Paris conference of the International Congress of Mathematicians in 1900, as part of his list of 23 problems ... -->

Calculus is about change. One function tells how quickly another function is changing. Professor Strang shows how calculus applies to ... -->

Aryabhata (476–550 CE) was the first in the line of great mathematician-astronomers from the classical age of Indian mathematics and Indian astronomy. His works include the Āryabhaṭīya (499 CE, when ... -->

**The Free handwriting calculator for your iPhone or iPad**
Easy, simple and intuitive, just write the mathematical expression on the screen ... -->