High Quality Content by WIKIPEDIA articles! In mathematics, a root system is a configuration of vectors in a Euclidean space satisfying certain geometrical properties. The concept is fundamental in the theory of Lie groups and Lie algebras. Since Lie groups (and some analogues such as algebraic groups) and Lie algebras have become important in many parts of mathematics during the twentieth century, the apparently special nature of root systems belies the number of areas in which they are applied. Further, the classification scheme for root systems, by Dynkin diagrams, occurs in parts of mathematics with no overt connection to Lie theory (such as singularity theory). Finally, root systems are important for their own sake, as in graph theory in the study of eigenvalues.

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High Quality Content by WIKIPEDIA articles! Rhoditis (also known as Roditis) is a pink-skinned Greek wine grape traditionally grown in the Peloponnese region of Greece. The grape was highly valued in the Greek wine industry prior to the phylloxera outbreak due to its ability to ripen late and maintain its acidity in hot climates like those of Peloponnese and Thessaly. However its susceptibility to powdery mildew and phylloxera dramatically reduced it plantings throughout the 20th century. Today it is most commonly blended with Savatiano in making the Greek wine Retsina.

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