sign = -sign;
for (unsigned r2=r0+1; r2<m; ++r2) {
for (unsigned c=c0+1; c<n; ++c)
- this->m[r2*n+c] = (this->m[r0*n+c0]*this->m[r2*n+c] - this->m[r2*n+c0]*this->m[r0*n+c]).expand();
+ this->m[r2*n+c] = (this->m[r0*n+c0]*this->m[r2*n+c] - this->m[r2*n+c0]*this->m[r0*n+c]).normal();
// fill up left hand side with zeros
for (unsigned c=r0; c<=c0; ++c)
this->m[r2*n+c] = _ex0;