We give an explicit characterization for group extensions that correspond to elements of the symmetric cohomology HS 2(G, A). We also give conditions for the map HS n (G, A) → H n (G, A) to be injective.
展开▼
机译:我们给出了与对称同调HS 2 sup>(G,A)的元素相对应的组扩展的显式表征。我们还给出了条件图HS n sup>(G,A)→H n sup>(G,A)是内射的。
展开▼