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Published online by Cambridge University Press: 20 January 2009
A (k – l)-field on Sn-1 may be given as a section ϕ of the fibre bundle
with fibre Vn-1, k-1 or, equivalently, as a semi-orthogonal map, i.e., a map
which is isometric in the second variable and such that for the basis vector e1∈Rk and every x∈Rn