CoCalc -- Hat.g

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GAP 4.8.9 installation with standard packages -- copy to your CoCalc project to get it

Project: cocalc-sagemath-dev-slelievre

Path: gap4r8 / pkg / SCO-2017.09.10 / examples / orbifolds / Hat.g

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#The Hat (upper Teardrop) orbifold

M := [ [1,2,3], [1,2,4], [1,3,4] ];
G := Group( (1,2) );
iso := rec( 1 := G );
mu := [
[ [3], [1,3], [1,2,3], [1,3,4], x -> (1,2) ],
[ [3], [1,3], [1,3,4], [1,2,3], x -> (1,2) ]
];

dim := 4;