Revert "Correct calculation of 2D Jacobian determinant"
Revert "Correct calculation of 2D Jacobian determinant"

This reverts commit 44b35c70b78b7e6aa755dc533ffa382c185cb857.

YetAnotherMinion/core,yangf4/core,yangf4/core,yangf4/core,YetAnotherMinion/core,yangf4/core,YetAnotherMinion/core,YetAnotherMinion/core,YetAnotherMinion/core,yangf4/core