we have the much more manageable
- k1 I_x² u + k1 I_x I_y v = - k1 I_t
- k1 I_x I_y u + k1 I_y² v = - k1 I_t
+ k1 I_x² u + k1 I_x I_y v = - k1 I_t I_x
+ k1 I_x I_y u + k1 I_y² v = - k1 I_t I_y
ie., two linear equations in u and v. Now, you will notice two
immediate problems by this equation set: