"Source: Text/Geometry/ModSym.text";
"Line: 1685";
"Date: Thu Sep 25 14:47:45 2025";
"Main: Fri Sep 26 14:29:19 2025";
// original file: Text/Geometry/ModSym.text, line: 1685
// Example: H145E15 ()
print "Example: H145E15";
ei := GetEchoInput();
SetEchoInput(true);
M := ModularSymbols(11,4,+1); M;
HeckeOperator(M,2);
IntegralHeckeOperator(M,2);
DualHeckeOperator(M,2);
S := CuspidalSubspace(M);
HeckeOperator(S, 2);
DualHeckeOperator(S, 2);
// NOT the transpose!
AtkinLehner(S, 11);
StarInvolution(S);   
M := ModularSymbols(11,4,-1); M;
S := CuspidalSubspace(M);
AtkinLehner(S, 11);
StarInvolution(S);   
SetEchoInput(ei);
