A reciprocity for symmetric algebras

The aim of this note is to show, that the reciprocity property of group algebras in [5, (11.5)] can be deduced from formal properties of symmetric algebras, as exposed in [1], for instance

SSSPM J1549−-3544 Is Not a White Dwarf

Spectroscopy and photometry demonstrate that SSSPM J1549$-$3544 is not a cool white dwarf but a high velocity metal-poor halo star.Comment: 8 pages, 1 figure, 2 tables, accepted to ApJ Letter