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On component groups of Jo(N) and degeneracy maps
For an integer M >1 and a prime p ≥ 5 not dividing M, we study the kernel of the degeneracy map ΦʳMp,p --˃ ΦMpʳ,p, where ΦMp,p and ΦMpʳ,p are the component groups of J0(Mp) and J0(Mpʳ), respectively. This is then ...
Almost perfect sequences with θ=2
Almost perfect sequences with θ=2 are studied in this paper. Recently Arasu, Ma and Voss  studied such sequences and they could only obtain sequences having periods 8, 12 and 28. In this paper, we prove that no other ...