parabolic element of PSL(2,ℤ)
C51328
concept
A parabolic element of PSL(2,ℤ) is a Möbius transformation represented by an integer 2×2 matrix of determinant 1 with trace ±2, which fixes exactly one point on the extended real line (typically a rational cusp) and acts there by translation.
Instances (1)
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T:z ↦ z+1
surface form: T : z ↦ z + 1