Geography of Belgium have repercussions for neighboring countries; uncertainties regarding federal and regional responsibilities (now resolved) have slowed progress in tackling environmental challenges. The main cities in Belgium in terms of population are Brussels, Antwerp, Ghent, Charleroi and Liège. Other notable cities include Bruges, Namur, Leuven, Mons and Mechelen. Geography of Belgium Belgium is a federal state located in Western Europe, bordering the North Sea. Belgium shares borders with France (556 km), Germany (133 km), Luxembourg (130 km) and the Netherlands (478 km). Belgium comprises the regions of Flanders, Wallonia and Brussels. Total renewable water resources: 18.3 cu km (2011) Freshwater withdrawal (domestic/industrial/agricultural):
What Is Mathematics? What Is Mathematics? What Is Mathematics? is a mathematics book written by Richard Courant and Herbert Robbins, published in England by Oxford University Press. It is an introduction to mathematics, intended both for the mathematics student and for the general public. First published in 1941, it discusses number theory, geometry, topology and calculus. A second edition was published in 1996 with an additional chapter on recent progress in mathematics, written by Ian Stewart. The book was based on Courant's course material. Although Robbins assisted in writing a large part of the book, he had to fight for authorship. Nevertheless, Courant