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Let f(τ) be a Hauptmodul for Γ_0(2) that has zero at the cusp infinity. We construct the 2-adic modular form f^^~ from f(τ) by using Atkin's method, which is an eigenfunction of the Hecke operator U. ...We expand f^^~ as a formal power series in f(τ). We can compute explicitly the 2-adic ordinal of these coefficients of the f-expansion of f^^~. We show that f^^~ coincides with the 2-adic modular form constructed from the modular invariant j(τ) by using Atkin's method.続きを見る
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