反序律B{1,2,i}A{1,2,i}=(AB){1,2,i}i=3,4成立的充要条件
반서률B{1,2,i}A{1,2,i}=(AB){1,2,i}i=3,4성립적충요조건
Necessary and sufficient conditions for reverse order laws B{ 1,2,I}A { 1,2,I }(∈)(AB) {1,2,I} ,I=3,4
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