 Raynaud's isogeny theorem

Raynaud's isogeny theorem is an important result in the field of algebraic geometry, particularly in the study of abelian varieties and their isogenies. The theorem establishes a connection between abelian varieties, specifically abelian varieties that are defined over a number field or a finite field, and their isogenies, which are morphisms between these varieties that preserve their group structure and have finite kernel.