# All Questions

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### Lyndon–Hochschild–Serre spectral sequence for not normal subgroup

Is there Lyndon–Hochschild–Serre spectral sequence for not normal subgroup? What can you say about it? Can you describe $E^{p, q}_1$ ? What is about $E^{p, q}_2$? What is the best technique to get ...
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### Dualization of a theorem of Øystein Ore

This post is a dualization of Generalization of a theorem of Øystein Ore in which we have proved: Theorem: Let $(H \subset G)$ be an inclusion of finite groups such that the lattice ...