文摘
This paper is to present some equivalent conditions concerning the reverse order law class="mathmlsrc">class="formulatext stixSupport mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0022247X16302566&_mathId=si1.gif&_user=111111111&_pii=S0022247X16302566&_rdoc=1&_issn=0022247X&md5=c26d4c265ff2e66c50aee07cd45e21b3" title="Click to view the MathML source">(PQ)D=QDPDclass="mathContainer hidden">class="mathCode"> for the Drazin invertible operators P and Q with partial commutative properties class="mathmlsrc">class="formulatext stixSupport mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0022247X16302566&_mathId=si112.gif&_user=111111111&_pii=S0022247X16302566&_rdoc=1&_issn=0022247X&md5=d4523a7b822a0742e4166762b516e7e8" title="Click to view the MathML source">[P,PQ]=0class="mathContainer hidden">class="mathCode"> or class="mathmlsrc">class="formulatext stixSupport mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0022247X16302566&_mathId=si144.gif&_user=111111111&_pii=S0022247X16302566&_rdoc=1&_issn=0022247X&md5=e9a3af52121541bc4cd94e1f3bdce775" title="Click to view the MathML source">[Q,PQ]=0class="mathContainer hidden">class="mathCode"> or class="mathmlsrc">class="formulatext stixSupport mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0022247X16302566&_mathId=si207.gif&_user=111111111&_pii=S0022247X16302566&_rdoc=1&_issn=0022247X&md5=996d700e750243363786a6fb0cb825e3" title="Click to view the MathML source">[P,PQQD]=0class="mathContainer hidden">class="mathCode"> or class="mathmlsrc">class="formulatext stixSupport mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0022247X16302566&_mathId=si270.gif&_user=111111111&_pii=S0022247X16302566&_rdoc=1&_issn=0022247X&md5=7dffba1316a5e9767bd2f93776b4f55c" title="Click to view the MathML source">[Q,PPDQ]=0class="mathContainer hidden">class="mathCode">.