The `Rome de Lisle problem' on the vertex and edge truncations has been formulated and solved for all crystal closed simple forms (two, eight, five and 15 for orthorhombic, trigonal + hexagonal, tetragonal and cubic syngonies, respectively). The collections of simple forms obtained are enumerated and considered as special combinations of simple forms in symmetry classes.

中文翻译：

---

罗马的莱尔问题。

已经针对所有晶体闭合的简单形式（分别为正交，三角形+六边形，四边形和立方的同形体）的所有晶体闭合简单形式制定并解决了“顶点和边缘截断”的“罗马问题”。枚举获得的简单形式的集合，并将其视为对称类中简单形式的特殊组合。