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The Nielsen–Schreier theorem states that if H is a subgroup of a free group G, then H is itself isomorphic to a free group. That is, there exists a set S of elements which generate H , with no nontrivial relations among the elements of S .
The image under a Nielsen transformation (elementary or not, regular or not) of a generating set of a group G is also a generating set of G. Two generating sets are called Nielsen equivalent if there is a Nielsen transformation taking one to the other (beware this is not an equivalence relation). If the generating sets have the same size, then ...
Nielsen made a substantial technological advance before network-era norms entered crisis with transition to the national People Meter sample in 1987. Although People Meters presented substantial improvements over the previous system, the alteration in audience measurement caused significant controversy.
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As Nielsen faces increasing competition to measure TV activity, it’s trying to make more of the data advertisers say they want more readily available. The media measurement giant is expected as ...
The advantage of this screw type over a self-drilling screw is that, if the screw is reinstalled, new threads are not cut as the screw is driven. set bolt: tap bolt, setscrew: A bolt that is threaded all the way to the head. An ASME B18.2.1 compliant set/tap bolt has the same tolerances as an ASME B18.2.1 compliant hex cap screw. set screw ...