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Let $T$ be a rooted tree with root node $r_T$.
Let $\Gamma$ be a branch of $T$.
Then $\Gamma$ is infinite if and only if it has no leaf node at the end.
- 1996: H. Jerome Keisler and Joel Robbin: Mathematical Logic and Computability ... (previous) ... (next): $\S 1.7$: Tableaus