In the middle ages, the attitude of the Christian church towards mathematics changed greatly. Because the church believes that geometry is related to religious beliefs, it is forbidden to teach geometry. However, in the Renaissance, humanists rediscovered geometry and regarded it as a pure science.
Since modern times, philosophy of mathematics has changed from focusing on basic problems to focusing on application problems. At the beginning of the 20th century, logicism and formalism became the mainstream thoughts. Since the mid-20th century, axiomatic methods, model theory and symbolic computation have become the mainstream.