I just learnt that the octonion projective space $\mathbf{OP}^n$ exists only for $n=1,2$. How about the "octonion Grassmannian", i.e. the space of $k$-subspace of $\mathbf O^n$? For which values of $(k,n)$ does it make sense?
2026-02-23 06:36:24.1771828584
Octonion Grassmanian?
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