DEL OPERATOR

Vector differential operator `del’ is represented by a symbol $\nabla$. Its another name is `nabla’. For three dimensional case, it is defined as

$\nabla$ = id/dx + jd/dy + kd/dz

where I, j, k are unit  vectors in the directions of co-ordinate axis X, Y and Z respectively.

Del is operated in three ways viz, gradient, divergence and curl, which we will discuss in next three sections.