Multi-configurational self-consistent field (MCSCF) is a method in quantum chemistry used to generate qualitatively correct reference states of molecules in cases where Hartree–Fock and density functional theory are not adequate (e.g., for molecular ground states which are quasi-degenerate with low-lying excited states or in bond breaking situations). It uses a linear combination of configuration state functions (CSF) or configuration determinants to approximate the exact electronic wavefunction of an atom or molecule. In an MCSCF calculation, the set of coefficients of both the CSFs or determinants...

In mathematics, a finite field or Galois field (so-named in honor of Évariste Galois) is a field that contains a finite number of elements. As with any field, a finite field is a set on which the operations of multiplication, addition, subtraction and division are defined and satisfy certain basic rules. The most common examples of finite fields are given by the integers mod p when p is a prime number. The number of elements of a finite field is called its order. A finite field of order q exists if and only if the order q is a prime power pk (where p is a prime number and k is a positive integer...

Ortho is a Greek prefix meaning “straight,” “upright,” “right,” or “correct”. Ortho may refer to: In science arene substitution patterns, two substituents that occupy adjacent positions on an aromatic ring Chlordane, an organochlorine compound that was used as a pesticide In medicine: Orthomyxovirus - family of viruses to which influenza belongs Orthodontics, a specialty of dentistry concerned with the study and treatment of malocclusions Orthopedic, the study of the musculoskeletal system Ortho-DOT, a psychedelic drug Ortho-cept and Ortho Tri-cyclen, kinds of oral contraceptive drug In theology...