标题： 非形式齐次空间 显示英文标题

标题： Non-formal Homogeneous Spaces

摘要： 已知若干大类的齐次空间是形式的——在有理同伦理论的意义下。 然而，似乎已知的非形式齐次空间的例子要少得多。 在本文中，我们提供了非形式齐次空间的若干构造原理和特征，这将产生大量例子。 这将使我们能够证明，在维度72及以上，每个维度都可以找到这样的空间。 显示英文摘要

摘要： Several large classes of homogeneous spaces are known to be formal---in the sense of Rational Homotopy Theory. However, it seems that far fewer examples of non-formal homogeneous spaces are known. In this article we provide several construction principles and characterisations for non-formal homogeneous spaces, which will yield a lot of examples. This will enable us to prove that, from dimension 72 on, such a space can be found in each dimension.