In the light of later work on Galois theory, the principles of these proofs have been clarified.
In 1986, Boros settled (with T. Szőnyi) a conjecture by Beniamino Segre about the cyclic structure of finite projective planes, and in 1988 provided the best known bound for a question posed by Paul Erdős about blocking sets of Galois planes.
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Sylow was a high school teacher in Halden, Norway, from 1858 to 1898, and a substitute lecturer at Christiania University in 1862, covering Galois theory.