docs: public static boolean cholL( DMatrix3x3 A ) {
  
          A.a11 = Math.sqrt(A.a11);
          A.a12 = 0;
          A.a13 = 0;
          A.a21 = (A.a21)/A.a11;
          A.a22 = Math.sqrt(A.a22-A.a21*A.a21);
          A.a23 = 0;
          A.a31 = (A.a31)/A.a11;
          A.a32 = (A.a32-A.a31*A.a21)/A.a22;
          A.a33 = Math.sqrt(A.a33-A.a31*A.a31-A.a32*A.a32);
          return !UtilEjml.isUncountable(A.a33);
      }