A vector  eld
In tensor  elds, this operation of A superscript alpha is de ned as epsilonsuperscript alpha mu nu times A subscript nu semicolon mu. In Maxwell's      equations, this operation of B is equal to μ0J+ε0μ0 times the partial derivative of E with respect to t . A vector  eld u such that u cross this operation of u is zero is said to be a   Beltrami  eld. This operation's namesake theorem states that the integral over S of this function of F da is equal to the integral over partial A of F ds. This operation is equal to the cross product of the gradient vector with a vector  eld. A vector  eld where this quantity is zero at all points is known as irrotational. For ten points, identify this operation, alternatively known as  rotor  and representing the circulation of a vector  eld around a point.
In tensor  elds, this operation of A superscript alpha is de ned as epsilonsuperscript alpha mu nu times A subscript nu semicolon mu.
curl [accept rotor or rotational before read, accept del cross before  cross product  and prompt afterward]