grad, curl , div operator got any meaning?? ∇x F (t) same as the first derivative of F with respect to t , or will get the gradient of F which is normal to the F ? ∇ dot F (t) , will get the scalar value of what?? lets say F is force , then can anyone please give me the meaning of those operator on the vector mean? ∇x F (t) will get the gradient of F which is normal to the F . I think of this because in the stoke's theorem the ∇x F (t) have to dot with n , where n should be the unit normal vector of the surface. I am blur , please guide . Thank you.