We give an approximate Menger-type theorem for when a graph $G$ contains two $X-Y$ paths $P_1$ and $P_2$ such that $P_1 \cup P_2$ is an induced subgraph of $G$. More generally, we prove that there exists a function $f(d) \in O(d)$, such that for every graph $G$ and $X,Y \subseteq V(G)$, either there exist two $X-Y$ paths $P_1$ and $P_2$ such that the distance between $P_1$ and $P_2$ is at least $d$, or there exists $v \in V(G)$ such that the ball of radius $f(d)$ centered at $v$ intersects every $X-Y$ path.
翻译:我们给出一个近似的Menger型定理,用于描述图$G$包含两条$X-Y$路径$P_1$和$P_2$且$P_1 \cup P_2$为$G$的诱导子图的情形。更一般地,我们证明存在一个函数$f(d) \in O(d)$,使得对于任意图$G$及$X, Y \subseteq V(G)$,要么存在两条$X-Y$路径$P_1$和$P_2$,使得$P_1$与$P_2$之间的距离至少为$d$;要么存在$v \in V(G)$,使得以$v$为中心、半径为$f(d)$的球与每条$X-Y$路径相交。