**Group theory**

Symmetry element and symmetry operation

Reducible and irreducible representations

Elementary row operation and elementary matrix

Decomposition of group representations

Symmetry adapted linear combination (SALC) of orbitals

Determining the degrees of freedom of a molecule using group theory

Group theory and infra-red spectroscopy

Group theory and its applications in organic chemistry

Group theory and its applications inorganic chemistry

Subgroup (descent of symmetry)