On Span Of Flag Manifolds Rf(1, 1, 1, N − 3)

Abstract

We obtain bounds for the span of the incomplete flag manifold of length 3, RF(1, 1, 1, n−3), n ≥ 4 using suitable fiberings where RF(1, 1, 1, n − 3) is either a total space or base space. We obtain exact values for n = 5 and 6 using non vanishing Stiefel-Whitney classes.