Abstract :
We show how Rao and Vaserstein′s identities may be related to the groups S22 and S3. We then develop a theory that enables us to produce various identities, for any given pair (G, ε) of a group G and a character ε defined on G. When ε is ± 1-valued, these identities may be used to obtain upper bounds for the easier Waring problem over image and image. This approach may be considered as an alternative to the Tarry-Escott problem.