Invented by Leonardo Torres in 1920, the Torres calculating machine is a machine that solves essential addition, subtraction, ...

A simple brainteaser that tests your math and ... a solution to a sequence that does not follow the written rules of arithmetic and requires a bit of outside-of-the-box thinking.

Put the question into a mathematical ... is extremely simple. In reality, most algebraic expressions have at least two variables. In the above example, you would have: Often, equations are ...

Methods for solving linear, ordinary, and partial differential equations of mathematical physics. Green's functions, distribution theory, integral equations, transforms, potential theory, diffusion ...