A

David

Darling

del

Del, also known as alted or nabla, is the vector operator Δ, expressed in Cartesian coordinates as

 

del

 

The product of Δ and a scalar S yields a vector field called grad S (the gradient of S):

 

grad

 

The scalar product of Δ with a vector V is the divergence of V (div); the vector product of Δ with V is the curl of V.