《BCI-代數》內容簡介：This book is mainly designed for the graduate students who are in-terested in the theory of BCK and BCI-algebras.BCI-algebras are a wider class than BCK-algebras, introduced by　Kiyoshi Iseki in 1966. BCI-algebras as a class of logical algebras are　the algebraic　formulations of the set difference together with its pro-perties in set theory and the implicational functor in logical systems.They are closely related to partially ordered commutative monoids　as well as various logical algebras. Their names are originated fromthe combinators B, C, K and I in combinatory logic. The early re-search work was mainly carried out among the Japanese mathemati-cians Kiyoshi Is~ki and Shotaro　Tanaka, etc. who did a great deal of　foundation work. Since late 1970s, their work has been paid much　attention. In particular, the participation in the research of Polish　mathematicians Tadeusz Traczyk and Andrzej Wronski as well as　Australian mathematician William H. Cornish, etc. is making this　branch of algebra develop rapidly. Many interesting and important　results are discovered continuously. Now, the theory of BCI-algebras　has been widely spread.