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Let oxy denote a fixed autotopism triangle of a finite commutative semifield plane of even order q N , with middle nucleus GF(q). A point I {x, y, o} is called a central unit of the plane, relative to oxy, if coordinatising the plane by a semifield, in the standard way with I chosen as unit point and ox, oy as axes, yields a commutative semifield D I . It is shown that the set...
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