  The larger center-of-mass energy of the Large Hadron Collider Run 2 opens up
the possibility of a more detailed study of the quartic vertices of the
electroweak gauge bosons. Our goal in this work is to classify all operators
possessing quartic interactions among the electroweak gauge bosons that do not
exhibit triple gauge-boson vertices associated to them. We obtain all relevant
operators in the non-linear and linear realizations of the $SU(2)_L \otimes
U(1)_Y$ gauge symmetry.
