埃尔朗根 āi'ěrlǎnggēn Erlangen Origin Definitions Defs Strokes Stroke Words Sentences Sents 埃尔朗根纲领 āi'ěrlǎnggēngānglǐng Erlangen program The Erlangen program; a famous research program proposed by Felix Klein in 1872 regarding the relationship between geometry and group theory