Sidon set
A subset \(A\) of \(\Bbb N\) is called a Sidon set(or Sidon sequence) if the only solutions of the equation \(x+y=z+w\) with \(x,y,z,w\in A\) are the trivial ones with \(x=z, y=w\) or \(x=w, y=z\). 换句话说, \(A=\{a_0,a_1,a_2,\dotsc\}\) 是一个 Sidon …
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