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Condensing phenol with pyridine-2-aldehyde has been shown to give 4,4′-dihydroxydiphenyl(2-pyridyl)methane (I) together with 24–29% of its isomer 2,4′-dihydroxydiphenyl(2-pyridyl)methane (II). Repeated crystallizations of the mixt...

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We show several results concerning the finite groups that occur as Galois groups of unramified covers of projective curves in characteristicp. In particular, we prove that every finite group withggenerators occurs over some curve of gen...

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The class of ω-languages recognized by systolic (binary) tree automata is introduced. This class extends the class of Büchi ω-languages though maintaining the closure under union, intersection and complement and the decidability of e...

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The solar minimum between solar cycles 23 and 24 during the period 2007–2009 has been the longest and deepest one at least since for the last 100 years. We suggest that the Sun is going to his next supercenturial minimum. The mai...

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There is a widely held belief that backward vertical integration provides firms with the potential for a low-cost competitive advantage, and forward vertical integration provides them with the potential for a differentiation advantage. ...

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