... those indices. Thus, if S µνρ= S νµρ, (1.64)we say that S µνρis symmetric in its first two indices, while if S µνρ= S µρν= S ρµν= S νµρ= S νρµ= S ρνµ, (1.65)we say that S µνρis symmetric ... vector is an abstract geometrical entity, while the componentsare just the coefficients of the basis vectors in some convenient basis. (Since we will usuallysuppress the explicit basis vectors, the ... this ensures thatthe scalar (1.35) is invariant under Lorentz transformations, just as it should be.Let s consider some examples of dual vectors, first in other contexts and then in Minkowskispace....