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Grassmannian of oriented real 4-dimensional subspaces of \mathbb{R}^{p+q} seems to be wrong, where is the q coming from, I would suggest q=4 —Preceding unsigned comment added by 131.220.132.179 (talk) 14:34, 21 February 2011 (UTC)Reply
Thanks -- corrected --Tiphareth (talk) 21:35, 23 February 2011 (UTC)Reply