Inmathematics,modular units are certain units ofrings of integers of fields ofmodular functions, introduced byKubert and Lang (1975). They are functions whosezeroes andpoles are confined to the cusps (images of infinity).

• Cyclotomic unit
• Elliptic unit

• Kubert, Daniel S.;Lang, Serge (1981),Modular units, Grundlehren der Mathematischen Wissenschaften [Fundamental Principles of Mathematical Science], vol. 244, Berlin, New York:Springer-Verlag,ISBN 978-0-387-90517-4,MR 0648603,Zbl 0492.12002
• Kubert, Daniel S.;Lang, Serge (1975), "Units in the modular function field. I",Mathematische Annalen,218 (1):67–96,doi:10.1007/BF01350068,ISSN 0025-5831,MR 0437496,Zbl 0311.14005

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