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D.6.13.1 detadj
Procedure from library mondromy.lib (see mondromy_lib).
- Usage:
- detadj(U); U matrix
- Assume:
- U is a square matrix with non zero determinant.
- Return:
- The procedure returns a list with at most 2 entries.
If U is not a sqaure matrix, the list is empty.
If U is a sqaure matrix, then the first entry is the determinant of U.
If U is a square matrix and the determinant of U not zero,
then the second entry is the adjoint matrix of U.
- Display:
- The procedure displays comments if printlevel>=1.
Example:
| | LIB "mondromy.lib";
ring R=0,x,dp;
matrix U[2][2]=1,1+x,1+x2,1+x3;
list daU=detadj(U);
daU[1];
==> -x2-x
print(daU[2]);
==> x3+1, -x-1,
==> -x2-1,1
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