The valuations of the near 2n-gon In

The maximal and next-to-maximal subspaces of a nonsingular parabolic quadric Q(2n, 2), n >= 2, which are not contained in a given hyperbolic quadric Q(+)(2n - 1, q) subset of Q(2n, q) define a sub near polygon I-n of the dual polar space DQ(2n, 2). It is known that every valuation of DQ(2n, 2) induces a valuation of I-n. In this paper, we show that also the converse is true: every valuation of I-n is induced by a valuation of DQ(2n, 2). We will also study the structure of the valuations of I-n.

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