Quadrangles of Type F4
This chapter deals with the case that the building at infinity Λ of the Bruhat-Tits building Ξ is a Moufang quadrangle of type F₄. It begins with the hypothesis stating that Λ = (K, L, q) is a quadratic space of type F₄, K is complete with respect to a discrete valuation ν and F is closed with respect to ν, Λ is the Moufang quadrangle corresponding to a root group sequence, and R₀ and R₁ as the two residues of Ξ. The chapter also considers the theorem supposing that Λ is of type F₄ and that R₀ and R₁ are not both indifferent, and claims that both cases really occur. Finally, it presents the proposition that R₀ and R₁ are both indifferent if and only if q is totally wild.
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