机构:
Inst Computat & Expt Res Math, 121 South Main St, Providence, RI 02903 USAInst Computat & Expt Res Math, 121 South Main St, Providence, RI 02903 USA
Clery, Fabien
[1
]
van der Geer, Gerard
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机构:
Univ Amsterdam, Korteweg de Vries Inst, Postbus 9424, NL-1090 Amsterdam, NetherlandsInst Computat & Expt Res Math, 121 South Main St, Providence, RI 02903 USA
van der Geer, Gerard
[2
]
机构:
[1] Inst Computat & Expt Res Math, 121 South Main St, Providence, RI 02903 USA
We discuss two simple but useful observations that allow the construction of modular forms from given ones using invariant theory. The first one deals with elliptic modular forms and their derivatives, and generalizes the Rankin-Cohen bracket, while the second one deals with vector-valued modular forms of genus greater than 1.