Poincaré half-plane model
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Modular group
J-invariant
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Theta function
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Weierstrass elliptic function
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Dedekind eta function
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Linear fractional transformation
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David Mumford
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Projective linear group
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Congruence subgroup
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Free product
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List of algebraic geometry topics
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Leech lattice
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List of Lie groups topics
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Pentagonal number theorem
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Cantor function
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Möbius transformation
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Partition function (number theory)
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Orbifold
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Upper half-plane
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Modular form
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Quadratic form
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Diophantine approximation
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Symplectic group
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Special linear group
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General linear group
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Presentation of a group
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Elliptic function
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Simple continued fraction
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Felix Klein
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Self-similarity
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Pell's equation
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Pythagorean triple
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Pi
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Fundamental group
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Diffeomorphism
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Cantor set
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Carl Friedrich Gauss
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Modular group Gamma
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