with wxmaxima 0.7.1 ubuntu hardy
D:matrix([a,b],[b,c]);
cholesky(D);
Unable to find the Cholesky factorization -- an error. To debug this
try debugmode(true);
even with
assume(determinant(D)>0);
cholesky(D);
Unable to find Cholesky etc...
but
cholesky(transpose(D).D);
Is b^2+a^2 positive or zero?positive;
result...
which means cholesky symbolic works..