An algebraic system that reduces independent quantities to groupings whose relationships are then subject to algebraic operation. It was developed by Marius Sophus Lie (1842-1899), a Norwegian mathematician, and is used especially in studying behavior of fundamental atomic structure.

李氏代数(一种代数方法，即简化独立的量成为群，然后按其关系进行运算。由挪威数学家M.S.李(1842-1899)发明，主要用于研究基本原子结构的表现)。