00 - Van der Waals force The van der Waals equation is an equation of state that can be derived from a special form of the potential between a pair of molecules. Veja em Português 01 - Bras, Kets, and Matrices When quantum mechanics was originally developed (1925) the simple rules of matrix arithmetic was not yet part of every technically educated person’s basic knowledge. As a result, Heisenberg didn’t realize that the (to him) mysterious non-commutative multiplication he had discovered for his quantum mechanical variables was nothing other than matrix multiplication. 02 - a Slater determinant - In quantum mechanics is an expression which describes the wavefunction of a multi-fermionic system that satisfies anti-symmetry requirements and subsequently the Pauli exclusion principle by changing sign upon exchange of fermions. If you may need these contents in other language, try our Translator: