Semiclosed projections and applications

[摘要] We characterize the semiclosed projections and apply them to compute the Schur complement of a selfadjoint operator with respect to a closed subspace. These projections occur naturally when dealing with weak complementability. (c) 2021 Elsevier Inc. All rights reserved.

[发布日期] 2021-12-01

[关键词] Semiclosed idempotents;Operator ranges;Complementability