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Prime numbers, diophantine equations, diophantine approximations, analytic or algebraic number theory, arithmetic geometry, Galois theory, transcendental number theory, continued fractions

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Modular Lambda Function as a Cross ratio

What ie the meaning of the statement : Modular Lambda Function is such that,over any point $\tau$ in the upper half plane, its value can be described as a cross ratio of the branch points of a ramifie …