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LoadPackage( "GradedRingForHomalg", false );
S := GradedRing( HomalgFieldOfRationalsInDefaultCAS( ) * "x0..x3" );
A := KoszulDualRing( S, "e0..e3" );
LoadPackage( "GradedModules", false );
## [EFS, Example 7.1]:
## Let C be an elliptic quartic curve in P3 , and consider C as a sheaf on P3
C := HomalgMatrix( "[ x0^2 + x2^2 + x1*x3, x1^2+ x3^2+ x0*x2 ]", 2, 1, S );
C := LeftPresentationWithDegrees( C );
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