Elliptic operators in even subspaces

@article{Savin1999EllipticOI,
  title={Elliptic operators in even subspaces},
  author={A. Savin and B. Sternin},
  journal={Sbornik Mathematics},
  year={1999},
  volume={190},
  pages={1195-1228}
}
An elliptic theory is constructed for operators acting in subspaces defined in terms of even pseudodifferential projections. Index formulae are obtained for operators on compact manifolds without boundary and for general boundary-value problems. A connection with Gilkey's theory of η-invariants is established. 

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