We present a weak sufficient condition for the existence of Souslin trees at successor of regular cardinals. The result is optimal and simultaneously improves an old theorem of Gregory and a more recent theorem of the author.

中文翻译：

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普通红衣主教继任者的苏斯林树

我们提出了在常规基数的后继中存在 Souslin 树的弱充分条件。结果是最优的，同时改进了 Gregory 的旧定理和作者的更新定理。