e/Signature operator

Information
has gloss	eng: In mathematics, the signature operator is an elliptic differential operator defined on a certain subspace of the space of differential forms on a even dimensional compact Riemannian manifold, whose analytic index is the same as the topological signature of the manifold if the the dimension of the manifold is a multiple of four. It is a instance of a Dirac-type operator.
lexicalization	eng: signature operator
instance of	c/Elliptic partial differential equations