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This is due to differences in implementations of pow ( ) and exp ( ) and the signaling mechanisms used for overflow and underflow conditions . Mr. Lee was critical of U.S. educational authorities for what he said was a refusal to accept differences in learning aptitude between blacks , whites and other races in America .. However , it is unlikely that the non-coastal plain area of ANWR has the same level of resources that are estimated to be in the coastal plain area , due to differences in geology . Even without the effects of policy adjustments , similarities in average payment-to-cost ratios across groups still mask real differences in their distributions . Heterogeneity involves differences in control and agility in processes .