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What does the concept of closure in mathematics mean? This is in number theory. Who can recommend a basic reading of number theory?
.. for the operation × (this is just a symbol ...) in sets S and S, if it is for any A, b∈S and a×b∈S, then it is said that S is about × ... I read Adin's algebra ... Secondly, it is a preliminary study of advanced number theory ... The style of foreign books is different from that of domestic textbooks. ..
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