Leonid Ryvkin gives a motivated and self-sustained
introduction to n-plectic geometry with a special focus on symmetries. The
relevant algebraic structures from scratch are developed. The author generalizes
known symplectic notions, notably observables and symmetries, to the n-plectic
case, culminating in solving the existence question for co-moment maps for
general pre-n-plectic manifolds. Finally partial results scattered along the
literature are derived from our general result.