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Algae in medicine (Top left, bottom left, and bottom centre) Heather Angel; (top
centre) Richard H Chesher; (top right) Douglas P Wilson; (bottom right) Raniero
Maltini and Piero Solaini — SCALA from Art Resource/EB Inc. Zygospores
This introduces the following notion: given a ring S, the set of all elements a of S
such that ax — xa for every xe S is called the centre of S. It contains 0, also 1 if 5"
is unitary, and is a subring of S, necessarily commutative. If S is a division ring, ...
Top row: (left) Dodder (Cuscuta, family Convolvulaceae), a climbing parasite; (
centre) Old World pitcher plant (Nepenthes), a photosynthetic plant that captures
insects; (right) duckweed (Lemna, family Lemnaceae), one of the smallest of the ...
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The New Encyclopaedia Britannica (Encyclopaedia)User Review - Not Available - Book Verdict
For virtually all its 238 years,Britannica has ruled the shelves as a peerless general encyclopedia. Reviewers have consistently given it high marks for most of the 12 criteria identified inKister's ... Read full review