Coordinate question - above x-z plane

[cutesteph]

Coordinate question -- "above x-z plane"

Homework Statement

Say I want to verify a condition is true that ∇∇F = 0 above the x-z plane.Where F(x,y,z).

Does the "above x-z plane" mean in the x-z plane i.e. we evaluate ∇∇F(x,0,z) ?

 

[LCKurtz]

Homework Statement

Say I want to verify a condition is true that ∇∇F = 0 above the x-z plane.Where F(x,y,z).

Does the "above x-z plane" mean in the x-z plane i.e. we evaluate ∇∇F(x,0,z) ?

I would think "above the xz plane" would mean where y>0.