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إي. تي باركر (بالإنجليزية: E. T. Parker) هو رياضياتي أمريكي، ولد في 1926، وتوفي في 1991. (ar) Ernest Tilden Parker (* 1926; † 1991) war ein US-amerikanischer Mathematiker. Parker wurde 1957 an der Ohio State University bei Marshall Hall promoviert (On quadruply transitive groups). Er war Professor an der University of Illinois at Urbana-Champaign. Parker fand ein Gegenbeispiel (n=10) zu einer Vermutung von Euler, dass keine orthogonalen lateinischen Quadrate der Ordnung existieren, nachdem dies etwa gleichzeitig schon Raj Chandra Bose und S. S. Shrikhande gelungen war (n=22). Sie fanden ein Gegenbeispiel zur Vermutung für n=22. 1960 zeigte er mit Shrikhande und Bose, dass für alle Ordnungen orthogonale lateinische Quadrate existieren. Damals war er bei Remington Rand in der Abteilung UNIVAC. Sein Gegenbeispiel fand er aber nicht durch Computersuche, sondern in seiner Freizeit. 1968 widerlegte er mit seinem Studenten K. B. Reid eine Vermutung von Paul Erdős und Leo Moser über Tournamente. (de) Ernest Tilden Parker (1926–1991) was a professor emeritus of the University of Illinois at Urbana–Champaign. He is notable for his breakthrough work along with R. C. Bose and S. S. Shrikhande in their disproof of the famous conjecture made by Leonhard Euler dated 1782 that there do not exist two mutually orthogonal latin squares of order for every . He was at that time employed in the UNIVAC division of Remington Rand, but he subsequently joined the mathematics faculty at t University of Illinois. In 1968, he and a Ph.D. student, K. B. Reid, disproved a conjecture on tournaments by Paul Erdős and Leo Moser. Parker received his Ph.D. for work 'On Quadruply Transitive Groups' at Ohio State University in 1957; his advisor was Marshall Hall Jr. (en) Ernest Tilden Parker (1926 — 1991) foi um matemático erstadunidense. (pt) |
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إي. تي باركر (بالإنجليزية: E. T. Parker) هو رياضياتي أمريكي، ولد في 1926، وتوفي في 1991. (ar) Ernest Tilden Parker (1926 — 1991) foi um matemático erstadunidense. (pt) Ernest Tilden Parker (* 1926; † 1991) war ein US-amerikanischer Mathematiker. Parker wurde 1957 an der Ohio State University bei Marshall Hall promoviert (On quadruply transitive groups). Er war Professor an der University of Illinois at Urbana-Champaign. 1968 widerlegte er mit seinem Studenten K. B. Reid eine Vermutung von Paul Erdős und Leo Moser über Tournamente. (de) Ernest Tilden Parker (1926–1991) was a professor emeritus of the University of Illinois at Urbana–Champaign. He is notable for his breakthrough work along with R. C. Bose and S. S. Shrikhande in their disproof of the famous conjecture made by Leonhard Euler dated 1782 that there do not exist two mutually orthogonal latin squares of order for every . He was at that time employed in the UNIVAC division of Remington Rand, but he subsequently joined the mathematics faculty at t University of Illinois. In 1968, he and a Ph.D. student, K. B. Reid, disproved a conjecture on tournaments by Paul Erdős and Leo Moser. (en) |
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إي. تي باركر (ar) E. T. Parker (en) Ernest Tilden Parker (de) Ernest Tilden Parker (pt) |
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