Mathematics, 02.07.2021 04:40 lina93
Cho X là một tập hợp và S(X) là tập hợp tất cả các song ánh trên X. Chứng minh rằng S(X) cùng với phép hợp thành ánh xạ là một nhóm. Nhóm này có giao hoán không? Vì sao?
Answers: 1
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Cho X là một tập hợp và S(X) là tập hợp tất cả các song ánh trên X. Chứng minh rằng S(X) cùng với
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