  Dual third order Jacobsthal and dual third order Jacobsthal-Lucas numbers are
defined. In this study, we work on these dual numbers and we obtain the
properties e.g. some quadratic identities, summation, norm, negadual third
order Jacobsthal identities, Binet formulas and relations of them. We also
define new vectors which are called dual third order Jacobsthal vectors and
dual third order Jacobsthal-Lucas vectors. We give properties of these vectors
to exert in geometry of dual space.
