The Eisenstein ideal in Hida's ordinary Hecke algebra
The Eisenstein ideal in Hida's ordinary Hecke algebra
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飞驒普通赫克代数中的爱森斯坦理想
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发表时间:
1999
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通讯作者:
M. Emerton
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作者:
M. Emerton
For p ≥ 5 a prime and i 6≡ 0 (mod p − 1) let Tord par,(i) denote Hida’s ordinary Hecke algebra acting on the space of p-ordinary cusp forms of tame level one, arbitrary weight k, and tame nebentypus equal to ω(i−k) (where ω is the Teichmuller character). Let IEis denote the Eisenstein ideal in T ord par,(i) , that is, the ideal generated by the elements Tl − 1 − 〈l〉l−1 (for l a prime distinct from p) and the element Up− 1. Let Lp(ω, 1− s) denote the Kubota-Leopoldt p-adic L-function. In this note we give a simple proof of the fact that there is a canonical isomorphism Λ(i)/Lp(ω i, 1 − s) = Tord par,(i) /IEis (a result originally established in [10]) and use this isomorphism to give a direct proof of the main result of [9]. Our proof of the isomorphism depends on constructing a certain element in the full Hecke algebra T(i) which one can think of as being the “universal constant term” of a (not necessarily cuspidal) p-adic modular form.