Congruences on ``character'' values of permutation summands 

Xiangyong Wang

Proc. Amer. Math. Soc. 125 (1997), pp. 393-396 

Abstract. A class of congruences on ``character" values \Psi_L of a permutation
summand L are exhibited, from which follows the connectedness of the prime 
ideal spectrum of the Grothendieck ring of permutation summands.