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Both humans and machines must draw conclusions that are true in the `` best '' models of the facts being taken into account . We establish rigorous lower bounds for the bulk burning rate that are linear in the amplitude of the advecting velocity for a large class of flows . Because units of production are huge in the industry , learning can be measurably observed as a firm goes from one unit to the next . If you want to know what you are worth in a specific region try Salary.com . Now that we have created a growing number of users who are adroit in the use of our online collections , we are enjoying increased feedback on all aspects of our work : collection development , text encoding , image type and quality , and the design of the search and browse pages . It is not at all clear that Kuratowski 's theorem yields an efficient algorithm for planarity testing , but such algorithms exist and have running times which are linear in the number of edges in the graph being tested .