Abstract
A standard question in modular representation theory is: What is the i Ž . Ž . Ž . Ž Zr p -dimension of the Zr p -vector space Ext K , K ? The bars over A l m r the modules indicate the reduction of these modules modulo p; the other . notation is explained below. These numbers are called intertwining numbers. The attempts to determine these intertwining numbers are varied. One approach is suggested by the following special case of a theorem found in w x AB1 :
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