"Pi" features several references to mathematics and mathematical theories. This notation is popular in physics and mathematical physics. Categories represent abstractions of other mathematical concepts. These include most of the commonly used functions of mathematical physics. Hilbert is known as one of the founders of proof theory and mathematical logic. It is an organization of mathematical and logical concepts of data. APL is a language for mathematical computations. Calculus can be used in conjunction with other mathematical disciplines. This is followed by drawing pictorial representations of mathematical concepts. It provides the foundation of modern mathematical logic. It is also equivalent to the formal systems used in the field of mathematical logic. This is inconsistent in mathematical logic. These limitations are twofold&colon; philosophical (mathematical) and empirical (human known epistemic biases). Peano maintained a clear distinction between mathematical and logical symbols. Von Neumann made fundamental contributions to mathematical statistics.