The Drazin invertibility of the difference and the sum of two idempotent operators

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摘要

In this note, some equivalents are established of the Drazin invertibility of differences and sums of idempotent operators on a Hilbert space.

论文关键词：46C07,46C05,15A09,Idempotent,Drazin inverse,Positive operator

论文评审过程：Received 14 April 2009, Revised 5 September 2009, Available online 30 September 2009.

论文官网地址：https://doi.org/10.1016/j.cam.2009.09.028