The vastness of the universe, the tinyness of particles, the speed of rockets, the ingenuity of chemical engineering, the changes in the earth, the mysteries of biology, the complexity of daily life, and mathematics are used everywhere.——Hua Luogeng

Mathematics is the science that studies quantitative relationships and spatial forms in real life.——Engels

No matter how abstract any branch of mathematics is, it will one day be applied to the real world.——Roba Chevsky