Leonhard Kaiser
Leonhard may refer to: *Leonhard Euler (1707–1783), Swiss mathematician and physicist * Leonhard Hutter (1563–1616), German theologian * Karl Leonhard (1904–1988), German psychiatrist * Jim Leonhard (1982– ), American football safety * LEONHARD (2009– ), Oslo-based DJ collective * Leonhard Rauwolf (1535–1596), German physician and botanist *Leonhard Stejneger (1851–1943), American herpetologist *Wolfgang Leonhard Wolfgang Leonhard (16 April 1921 – 17 August 2014) was a German political author and historian of the Soviet Union, the German Democratic Republic and Communism. A German Communist whose family had fled Hitler's Germany and who was educated i ...

Leonhard Euler
Leonhard Euler ( , ; 15 April 170718 September 1783) was a Swiss mathematician, physicist, astronomer, geographer, logician and engineer who founded the studies of graph theory and topology and made pioneering and influential discoveries in many other branches of mathematics such as analytic number theory, complex analysis, and infinitesimal calculus. He introduced much of modern mathematical terminology and notation, including the notion of a mathematical function. He is also known for his work in mechanics, fluid dynamics, optics, astronomy and music theory. Euler is held to be one of the greatest mathematicians in history and the greatest of the 18th century. A statement attributed to Pierre-Simon Laplace expresses Euler's influence on mathematics: "Read Euler, read Euler, he is the master of us all." Carl Friedrich Gauss remarked: "The study of Euler's works will remain the best school for the different fields of mathematics, and nothing else can replace it." Euler is a ...
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Leonhard Hutter
Leonhard Hutter (also ''Hütter'', Latinized as Hutterus; 19 January 1563 – 23 October 1616) was a German Lutheran theologian. Life He was born at Nellingen near Ulm. From 1581 he studied at the universities of Strasbourg, Leipzig, Heidelberg and Jena. In 1594 he began to give theological lectures at Jena, and in 1596 accepted a call as professor of theology at Wittenberg, where he died twenty years later. Works Hutter was a stern champion of Lutheran orthodoxy, as set down in the confessions and embodied in his own ''Compendium locorum theologicorum'' (1610; reprinted 1863), being so faithful to his master as to win the title of "Luther redonatus." In reply to Rudolf Hospinian's ''Concordia discors'' (1607), he wrote a work, rich in historical material but one-sided in its argument, ''Concordia concors'' (1614), defending the formula of Concord, which he regarded as inspired. His ''Irenicum vere christianum'' is directed against David Pareus (1548–1622), professor primariu ...
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