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The audience for traditional classical music is overwhelmingly caucasian , whether in Europe or North America , and despite paying frequent lip service to the vague concept of " diversity , " few practitioners of the art have made any serious attempts to widen the appeal of the genre . As noted under Discussion Paper No. 86 above , the concept of " author " is not a simple one in USMARC . I know that if you categorify the concept of bundle ( or sheaf , really ) you get the concept of " gerbe " , and if you categorify the concept of connection you get the concept of " connective structure " ... Specifically , the book presents important strategies for avoiding the inconsistencies that can crop up in multi-threaded programs , addresses the concept of " liveness " - how to ensure that all threads in use are kept active simultaneously , examines state-dependent action , and demonstrates effective methods for handling user requests in a multi-threaded environment . The concept of " ambiguity " was explained by John Chancellor of NBC : " The trouble with Yasser Arafat is that his native language seems to be ambiguity .