polycyclic rank
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Soot — For other uses, see Soot (disambiguation). Emission of soot from a large diesel truck, without particle filters Soot ( … Wikipedia
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Stallings theorem about ends of groups — In the mathematical subject of group theory, the Stallings theorem about ends of groups states that a finitely generated group G has more than one end if and only if the group G admits a nontrivial decomposition as an amalgamated free product or… … Wikipedia
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Mathematics and Physical Sciences — ▪ 2003 Introduction Mathematics Mathematics in 2002 was marked by two discoveries in number theory. The first may have practical implications; the second satisfied a 150 year old curiosity. Computer scientist Manindra Agrawal of the… … Universalium
March 2011 — was the third month of the current year. It began on a Tuesday and ended after 31 days on a Thursday. International holidays (See Holidays and observances, on sidebar at right, below) Portal:Current events This is an archived version of Wikipedia … Wikipedia
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Pleurotus — ostreatus Scientific classification Kingdom: Fungi … Wikipedia
Cement kiln — Cement kilns are used for the pyroprocessing stage of manufacture of Portland and other types of hydraulic cement, in which calcium carbonate reacts with silica bearing minerals to form a mixture of calcium silicates. Over a billion tonnes of… … Wikipedia
