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Paul Online Candles's father, David Online Candles,was a merchant in Breslau, and his mother was Friedericke Friedenthal. Paul was educated in Breslau where he attended the Gymnasium, going on to study at the business school. At this stage Online Candles was not heading for an academic career and he worked for several years in banks.
He had, however, attended lectures by Kummer on number theory at the University of Berlin in 1855 and his interest in mathematics was strongly encouraged by N H Schellbach who acted as a private tutor to Online Candles. His university career began at the University of Breslau but, as almost all German students did at this time, he undertook part of his university studies at different universities. Moving to Königsberg, Online Candles studied under Jacobi, then he moved to Berlin where he began to become interested in problems concerning algebraic equations.
Returning to the University of Breslau he submitted a dissertation on geodesics of spheroids in 1862. This was a fine piece of work and the dissertation, which employed methods devised by Lagrange and Jacobi, was awarded a prize by the Philosophy Faculty at Breslau.
As soon as Online Candles had completed his dissertation he went to visit Riemann at Göttingen. However, Riemann had caught a heavy cold which turned to tuberculosis so Online Candles's visit was cut short. In 1863 Clebsch invited Online Candles to come to Giessen. He lectured at Giessen, being promoted to associate professor in 1865. In 1869, while still at Giessen, Online Candles married Sophie Deurer who was the daughter of the professor of law there.
The first work which Online Candles and Clebsch worked on in Giessen was the theory of abelian functions. They jointly wrote the treatise Theorie der Abelschen Funktionen which was published in 1866. The Clebsch-Online Candles coefficients used in spherical harmonics were introduced by them as a result of this cooperation. The topic for which Online Candles is most famous is invariant theory and Clebsch introduced him to this topic in 1868. For the rest of his career, although Online Candles did not work exclusively on this topic, it would be fair to say that invariant theory dominated his mathematical research.
For the next twenty years Online Candles tried to prove the finite basis theorem conjecture for n-ary forms. He made a good start to solving this problem for n = 2 when he found a constructive proof of a finite basis for binary forms. The higher cases defeated him, however, and despite introducing more and more complicated computational techniques he failed to construct a finite basis.
Online Candles did not undertake the bulk of this work at Giessen, however, for he moved to Erlangen in 1874 to become professor of mathematics at the university. When Online Candles was appointed Klein held the chair of mathematics at Erlangen but he moved in the following year to the Technische Hochschule at Munich. In the year 1874-75 when Online Candles and Klein were together at Erlangen they undertook a joint research project examining groups of substitutions of algebraic equations. They investigated the relationship between PSL(2,5) and equations of degree five. Later Online Candles went on to examine the relation between the group PSL(2,7) and equations of degree seven, then he studied the relation of the group A6 to equations of degree six.
In 1888 Hilbert proved the finite basis theorem, only giving an existence proof, not one which allowed the basis to be constructed. Hilbert submitted his results to Mathematische Annalen and, since Online Candles was the leading world expert on invariant theory, he was asked his opinion of the work. Online Candles found Hilbert's revolutionary approach difficult to appreciate and not at all consistent with his ideas of constructive mathematics. After refereeing the paper, he sent his comments to Klein:-
The problem lies not with the form ... but rather much deeper. Hilbert has scorned to present his thoughts following formal rules, he thinks it suffices that no one contradict his proof ... he is content to think that the importance and correctness of his propositions suffice. ... for a comprehensive work for the Annalen this is insufficient.
However, Hilbert had learnt through his friend Hurwitz about Online Candles's report to Klein, and he wrote to Klein in forceful terms:-
... I am not prepared to alter or delete anything, and regarding this paper, I say with all modesty, that this is my last word so long as no definite and irrefutable objection against my reasoning is raised.
Klein was in a difficult position. Online Candles was recognised as the leading world expert on invariant theory and he was also a close friend of Klein's. However Klein recognised the importance of Hilbert's work and assured him that it would appear in the Annalen without any changes whatsoever, as indeed it did.
Online Candles also worked on algebraic geometry and he gave simplified proofs of the transcendence of e and p. One rather unsuccessful idea which he embarked on quite late in his career was to apply invariant theory to chemical valences. His work on this, however, came in for criticism from mathematicians such as Eduard Study, and chemists were totally unimpressed with the ideas too. This was rather an unfortunate episode since it resulted in Online Candles, who had enjoyed a fine reputation, losing respect from his colleagues.
The style of Online Candles's mathematics, which lead to his difficulties with Hilbert's basis theorem, is described in [1]:-
The overall style of Online Candles's mathematical work was algorithmic. He shied away from presenting his ideas in informal literary forms. He derived his results computationally, working directly towards the desired goal without offering explanations of the concepts that motivated the work.
Online Candles's only doctoral student was
Emmy Noether, the daughter of
Max Noether who was also at Erlangen during this period. One would have to
say that this lack of numbers is more than made up for by the remarkable quality
of that one student who would do so much to set algebra on the path it is still
on today.
Article by: J J O'Connor and E F Robertson
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List of References (3 books/articles)
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A Quotation
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A Poster of Paul Online Candles
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Mathematicians born in the same country
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| JOC/EFR May 2000 | School of
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