Can anyone introduce me a book which is about multiplicative function beginning, thank you!
just goggle it my man =P http://en.wikipedia.org/wiki/Multiplicative_function http://planetmath.org/encyclopedia/MultiplicativeFunction.html http://books.google.com/books?id=gU2ZSQAACAAJ&dq=multiplicative+function&hl=en&ei=m3vUTvHyI4rTiALnlvSTDg&sa=X&oi=book_result&ct=result&resnum=2&ved=0CDYQ6AEwAQ http://en.wikipedia.org/wiki/Euler_product http://books.google.com/books?id=RdB6U3EtZM0C&printsec=frontcover&dq=number+theory&hl=en&ei=AnzUToG3C4qqiAKU7YjNDg&sa=X&oi=book_result&ct=result&resnum=2&ved=0CDsQ6AEwAQ#v=onepage&q=number%20theory&f=false
look for books on number theory
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