For grassmannian manifold G_2(R^{2^{r}+2}), how can i show H^{2}(G_2(R^{2^{r}+2}))=Z_2+Z_2 ? in ring of cohomology De RhamWhit coefficients Z_2!
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ring of cohomology De Rham grassmannianFor grassmannian manifold G_2(R^{2^{r}+2}), how can i show H^{2}(G_2(R^{2^{r}+2}))=Z_2+Z_2 ? in ring of cohomology De Rham!
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