iReshalka – the title speaks for itself, and if in more detail – a calculator for mathematical problems. In other words, the application helps to solve different problems, for example, the construction of a graph of a function in a coordinate system, the solution of systems of linear equations, vectors and matrices, etc. … Moreover, it does not simply produce the finished result, but rather paints the solution’s progress, which is its own sort of coach. The theory of numbers, fractions, geometry, areas and perimeters, volumes and surface areas! So there is nothing impossible and difficult in solving mathematical problems!