Möbius group

noun

(group theory) The projective general linear group mathbf PGL(2,ℂ): the group of Möbius transformations on the Riemann sphere.

The Möbius group is a fundamental concept in mathematics.

意味（1）

(group theory) The projective general linear group mathbf PGL(2,ℂ): the group of Möbius transformations on the Riemann sphere.

意味（2）

(group theory) For a given dimension n, the group of projective transformations leaving a particular hypersphere invariant.