证明函数f:z + * z + → z + 是一对一且是映上的,其中f(m,n) = (m+n-2)(m+n -1)/2 + m
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![证明函数f:z + * z + → z + 是一对一且是映上的,其中f(m,n) = (m+n-2)(m+n -1)/2 + m](/uploads/image/z/11614999-31-9.jpg?t=%E8%AF%81%E6%98%8E%E5%87%BD%E6%95%B0f%3Az+%2B+%2A+z+%2B+%E2%86%92+z+%2B+%E6%98%AF%E4%B8%80%E5%AF%B9%E4%B8%80%E4%B8%94%E6%98%AF%E6%98%A0%E4%B8%8A%E7%9A%84%2C%E5%85%B6%E4%B8%ADf%28m%2Cn%29+%3D+%28m%2Bn-2%29%28m%2Bn+-1%29%2F2+%2B+m)
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