Subcritical pattern languages for and/or trees

Subcritical pattern languages for and/or trees
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和/或树的亚临界模式语言

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发表时间:
2008
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通讯作者:
J. Kozik
J. Kozik
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作者:
J. Kozik

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设P_k(f)$表示定义布尔函数f$的与/或树在具有固定数目的变量k$的与/或树的集合内的密度。本文证明了存在常数B_f使得当k时P_k(f)sim B_f cdot k^{-L(f)-1} 其中$L(f)$表示$f$的复杂度(即定义$f$的最小和/或树的大小)。这个定理已经由Daniele Gardy和Alan Woods与它的对应物一起被证明了对于由一些临界Galton-Watson过程定义的分布$pi$。本文提出的方法也可用于证明$pi$的类似性质。
Let $P_k(f)$ denote the density of and/or trees defining a boolean function $f$ within the set of and/or trees with fixed number of variables $k$. We prove that there exists constant $B_f$ such that $P_k(f) sim B_f cdot k^{-L(f)-1}$ when $k o infty$, where $L(f)$ denote the complexity of $f$ (i.e. the size of a minimal and/or tree defining $f$). This theorem has been conjectured by Daniele Gardy and Alan Woods together with its counterpart for distribution $pi$ defined by some critical Galton-Watson process. Methods presented in this paper can be also applied to prove the analogous property for $pi$.