No CrossRef data available.
Published online by Cambridge University Press: 18 May 2009
In [1], we introduced the notion of multiplicative forms on associative algebras 
 of finite rank over integral domains D, and obtained a complete classification when D ⊆, the complex field. We propose here to remove the hypothesis of associativity, using a refinement of the technique of Schafer [2]. In [l], it was noted that multiplicative forms extend uniquely under the adjunction of an identity when 
 is associative but not unitary; this appears difficult to verify in the general case, so that some mild restriction on 
 is required. We shall assume that 
 is biregular, that is that 
 contains elements eL, eR such that the linear maps x 
 eL x and x 
 xeR, are bijective on 
 We can then (§1) reduce the biregular case to the unitary case, which is handled in §2.