UPR — Equation 6-8 is incorrect

Equation 6-8 in subclause 6.2.3 does not seem to be correct.

The second term on the right-hand side has y _k in the denominator, which is inconsistent with the left-hand side. This term also begins with the partial derivative of y _k with respect to x _j, but x _j has been posited to relate to y _l, not y _k, so presumable the partial derivative in question is zero. Therefore, perhaps only the first term on the right-hand side is necessary.

Even though this section is not part of the normative profile, it is important background and should be correct.

Correction of Equation 6-8

The second term on the right hand side of this equation should be removed due its vanishing value.