It is known that poset theory is important to the study on greedoid theory.But what is the direct relation between poset theory and the containment relations between different kinds of greedoids?
众所周知,偏序集理论在研究广义拟阵论中起着重要作用.但是偏序集理论与不同种广义拟阵间的

系的直接联系是什么呢?
们推测,由于
边界的存在,
施反而将发展从郊外和乡村转移到了郊区和城市。
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。
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