Ostroleka is a city located in northeastern Poland on the Narew river, in the Mazowsze[?]voivodship about 120 km northeast of Warsaw. Population 55,300 (2000), area 29 km2. Ostroleka was granted city rights in 1373. See The official Ostroleka homepage (http://www.ostroleka.pl) for more information.
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The formula and its proof remain correct if the coefficients a, b and c are complex numbers, or more generally members of any field who ...