A Short Remark on Weierstrass Points at Infinity on X0(N)
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- Kohnen, W. Monatsh. Math. (2004) 143: 163. doi:10.1007/s00605-003-0054-1
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We point out that the formalism of the trace map and reduction modulo p can be used to give a short proof for the fact first proved by Ogg that ∞ is not a Weierstrass point on X0(pM) where p is a prime not dividing M and the genus of X0(M) is zero.