Abstract
We give an explicit description of the Kac-Peterson-Lepowsky construction of the basic representation for the affine Lie algebraB n (1). Using the conjugacy classes of the Weyl group ofB n, we describe all inequivalent maximal Heisenberg subalgebras of the corresponding affine Lie algebra. We associate to these Heisenberg subalgebras multicomponent charged and neutral free fermionic fields. The boson-fermion correspondence for these fields provides us with fermionic vertex operators, whose ‘normal ordered products’ give the (twisted) vertex operators of the Kac-Peterson-Lepowsky construction.
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