取决于函数 φ(n)、ψ(n) 和 σ(n) 的表达式的下界

Stoyan Dimitrov
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引用次数: 0

摘要

不等式 \varphi^2(n)+\psi^2(n)+\sigma^2(n) \geq 3n^2+2n+3 、\varphi(n)\psi(n)+\varphi(n)\sigma(n)+\sigma(n)\psi(n) \geq 3n^2+2n-1 连接\varphi(n)、\psi(n) 和\sigma(n)-函数的不等式被提出并证明。
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Lower bounds on expressions dependent on functions φ(n), ψ(n) and σ(n)
The inequalities \varphi^2(n)+\psi^2(n)+\sigma^2(n) \geq 3n^2+2n+3 , \varphi(n)\psi(n)+\varphi(n)\sigma(n)+\sigma(n)\psi(n) \geq 3n^2+2n-1 connecting \varphi(n), \psi(n) and \sigma(n)-functions are formulated and proved.
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