Transformations in the complex plane

Written by H. A. Verrill and I. Breeze, 2020/21.

Program for exploring transformations of the complex plane, drawing fundamental domains for subgroups of PSL(2,Z). Works on safari, with mouse.

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Farey Symbol: will appear here if a group is chosen

Variables

• Matrix:
 M =

Polygon:
Domains for SL2(Z):
Domain for
change group: Γ0 ()

change polygon by vertex
Vertices: pj = (a + ib)/c
 j a b c