Problems
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if n is odd then there exist isometric embeddings of \frac{1}{2}H_{n} in the half-spin Grassmann graphs of \Pi whose images are not apartments.
No problem here has yet been reviewed by a person.
if n is odd then there exist isometric embeddings of \frac{1}{2}H_{n} in the half-spin Grassmann graphs of \Pi whose images are not apartments.