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Published online by Cambridge University Press: 20 November 2018
An algebra $A$ is homogeneous if the automorphism group of
$A$ acts transitively on the one-dimensional subspaces of
$A$. The existence of homogeneous algebras depends critically on the choice of the scalar field. We examine the case where the scalar field is the rationals. We prove that if
$A$ is a rational homogeneous algebra with
$\dim\,A\,>\,1$, then
${{A}^{2}}\,=\,0$.