A module is defined to be an automorphism-invariant module if it is invariant under automorphisms of its injective hull. Quasi-injective modules and, more generally, pseudo-injective modules are all automorphism-invariant. Here we develop basic properties of these modules, and discuss when an automorphism-invariant module is quasi-injective or injective. Some known results on quasi-injective and pseudo-injective modules are extended.
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Univ Ho Chi Minh City, Fac Fundamental Sci Ind, 12 Nguyen Bao, Ho Chi Minh City, VietnamUniv Ho Chi Minh City, Fac Fundamental Sci Ind, 12 Nguyen Bao, Ho Chi Minh City, Vietnam
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Kazan (Volga Region) Federal University, KazanKazan (Volga Region) Federal University, Kazan
Abyzov A.N.
Quynh T.C.
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Da Nang University, Da NangKazan (Volga Region) Federal University, Kazan
Quynh T.C.
Tuganbaev A.A.
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Moscow Power Engineering Institute (National Research University), Moscow
M. V. Lomonosov Moscow State University, MoscowKazan (Volga Region) Federal University, Kazan
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Univ Danang, Univ Sci & Educ, Dept Math, 459 Ton Duc Thang, Danang City, VietnamUniv Danang, Univ Sci & Educ, Dept Math, 459 Ton Duc Thang, Danang City, Vietnam
Truong Cong Quynh
Abyzov, Adel
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Kazan Volga Reg Fed Univ, Dept Algebra & Math Log, 18 Kremlyovskaya St, Kazan 420008, RussiaUniv Danang, Univ Sci & Educ, Dept Math, 459 Ton Duc Thang, Danang City, Vietnam
Abyzov, Adel
Dinh Duc Tai
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Vinh Univ, Fac Math, 182 Le Duan St, Vinh City, Nghe An Provinc, VietnamUniv Danang, Univ Sci & Educ, Dept Math, 459 Ton Duc Thang, Danang City, Vietnam