Baily–Borel compactification
In mathematics, the Baily–Borel compactification is a compactification of a quotient of a Hermitian [symmetric space] by an arithmetic group, introduced by .
Example
- If C is the quotient of the upper half plane by a congruence subgroup of SL2, then the Baily–Borel compactification of C is formed by adding a finite number of cusps to it.