Constructing Simultaneous Hecke Eigenforms

T Shemanske, S Treneer, LH Walling

Research output: Contribution to journalArticle (Academic Journal)peer-review

1 Citation (Scopus)


It is well known that newforms of integral weight are simultaneous eigenforms for all the Hecke operators, and that the converse is not true. In this paper, we give a characterization of all simultaneous Hecke eigenforms associated to a given newform, and provide several applications. These include determining the number of linearly independent simultaneous eigenforms in a fixed space which correspond to a given newform, and characterizing several situations in which the full space of cusp forms is spanned by a basis consisting of such eigenforms. Part of our results can be seen as a generalization of results of Choie–Kohnen who considered diagonalization of "bad" Hecke operators on spaces with square-free level and trivial character. Of independent interest, but used herein, is a lower bound for the dimension of the space of newforms with arbitrary character.
Translated title of the contributionConstructing Simultaneous Hecke Eigenforoms
Original languageEnglish
Pages (from-to)1117 - 1137
Number of pages21
JournalInternational Journal of Number Theory
Issue number5
Publication statusPublished - Aug 2010

Bibliographical note

Publisher: World Scientific Publishing Co


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