What Does APIG Stand For?

APIG stands for Antisymmetrized Product Of Identical Geminals

APIG, or Antisymmetrized Product Of Identical Geminals, is a quantum chemical concept used to describe the correlation of electrons in systems with paired interactions. It represents a formally antisymmetrized wavefunction constructed from geminal functions, which are two-electron functions capturing the correlation between pairs of electrons in identical spatial states. APIG serves as a valuable framework in many-body theory for approximating the behavior of fermionic systems, particularly in condensed matter physics and quantum chemistry.