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arXiv math/0011239math.FAmath.MG
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极值近似凸函数与Hyers和Ulam定理中的最佳常数

Extremal Approximately Convex Functions and the Best Constants in a Theorem of Hyers and Ulam

S. J. Dilworth, Ralph Howard, James W. Roberts

摘要:

设$n\ge1$和$B\ge2$。定义在$n$ -单纯形$Δ_n$上的实值函数$f$关于$Δ_{B-1}$是近似凸的当且仅当f(\sum_{i=1}^B t_ix_i)\le \sum_{i=1}^B t_if(x_i)+1对于所有$x_1,...,x_B \in Δ_n$和所有$(t_1,...,t_B)\in Δ_{B-1}$ .我们明确地确定极值(即逐点最大)的功能,这种类型的顶点消失的$Δ_n$。我们还证明了一个Hyers-Ulam型的稳定性定理,作为一个特殊的情况下,$ε$ -凸函数的Hyers-Ulam稳定性定理中的最佳常数。

英文摘要:

Let $n\ge1$ and $B\ge2$. A real-valued function $f$ defined on the $n$-simplex $Δ_n$ is approximately convex with respect to $Δ_{B-1}$ iff f(\sum_{i=1}^B t_ix_i) \le \sum_{i=1}^B t_if(x_i) +1 for all $x_1,...,x_B \in Δ_n$ and all $(t_1,...,t_B)\in Δ_{B-1}$. We determine explicitly the extremal (i.e. pointwise largest) function of this type which vanishes on the vertices of $Δ_n$. We also prove a stability theorem of Hyers-Ulam type which yields as a special case the best constants in the Hyers-Ulam stability theorem for $ε$-convex functions.

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