Raymond van Bommel has contributed to these Knowls: Canonical height of an abelian variety, Cluster picture, Data for a cluster picture, Defining polynomial, Good and bad reduction, Potential good reduction, Potential toric rank, Real period, Reflex field, Reflex field of the reflex field, Regulator of a genus 2 curve, Regulator of an abelian variety, Root, Semiabelian variety, Theta divisor on a principally polarized abelian variety, Weil height