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D.6.12.1 KSker

Procedure from library kskernel.lib (see kskernel_lib).

Usage:
KSker(int p,q); p,q relatively prime integers

Return:
nothing; exports ring KSring, matrix KSkernel and list 'weights'; KSkernel is a matrix of coefficients of the
generators of the kernel of Kodaira-Spencer map,
'weights' is a list of degrees for variables T

Example:
 
LIB "kskernel.lib";
int p=6;
int q=7;
KSker(p,q);
setring Kskernel::KSring;
print(KSkernel);
==> 0,     0,     0,            0,            0,            2*T(1), 
==> 0,     0,     0,            0,            0,            3*T(2), 
==> 0,     0,     0,            0,            0,            4*T(3), 
==> 0,     0,     0,            2*T(1),       3*T(2),       9*T(4), 
==> 0,     0,     0,            3*T(2),       KSkernel[5,5],10*T(5),
==> 2*T(1),3*T(2),KSkernel[6,3],KSkernel[6,4],KSkernel[6,5],16*T(6)