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"John Rolfe Isbell (October 27, 1930 – August 6, 2005)Birth date from an excerpt of "The Harloe-Kelso Genealogy" by C. B. Harloe (1943), accessed 2011-03-23; death date from death announcement in the Buffalo News, August 28, 2005, reproduced by usgwarchives.net, accessed 2011-03-23. also states his birth date as 1930, but states it as 1931. was an American mathematician, for many years a professor of mathematics at the University at Buffalo (SUNY). Biography Isbell was born in Portland, Oregon, the son of an army officer from Isbell, a town in Franklin County, Alabama.Harloe (1943)... He attended several undergraduate institutions, including the University of Chicago, where professor Saunders Mac Lane was a source of inspiration. He began his graduate studies in mathematics at Chicago, briefly studied at Oklahoma A&M; University and the University of Kansas,The University of Kansas had professors Ainsley Diamond and Nachman Aronszajn, who had previously been professors at Oklahoma A&M.; The two moved to Kansas after Oklahoma A&M; had instituted a requirement that instructors sign a strict loyalty oath. Ainsley Diamond, as a quaker, had refused to sign the loyalty oath. and eventually completed a Ph.D. in game theory at Princeton University in 1954 under the supervision of Albert W. Tucker.. After graduation, Isbell was drafted into the U.S. Army, and stationed at the Aberdeen Proving Ground. In the late 1950s he worked at the Institute for Advanced Study in Princeton, New Jersey, from which he then moved to the University of Washington and Case Western Reserve University. He joined the University at Buffalo in 1969, and remained there until his retirement in 2002.Announcement of Isbell's death in Topology News, October 2005. Research Isbell published over 140 papers under his own name, and several others under pseudonyms. Isbell published the first paper by John Rainwater, a fictitious mathematician who had been invented by graduate students at the University of Washington in 1952. After Isbell's paper, other mathematicians have published papers using the name "Rainwater" and have acknowledged "Rainwater's assistance" in articles.The seminar on functional analysis at the University of Washington has been called the "Rainwater seminar". Isbell published other articles using two additional pseudonyms, M. G. Stanley and H. C. Enos, publishing two under each. Many of his works involved topology and category theory: *He was "the leading contributor to the theory of uniform spaces". *Isbell duality is a form of duality arising when a mathematical object can be interpreted as a member of two different categories; a standard example is the Stone duality between sober spaces and complete Heyting algebras with sufficiently many points.. *Isbell was the first to study the category of metric spaces defined by metric spaces and the metric maps between them, and did early work on injective metric spaces and the tight span construction.. In abstract algebra, Isbell found a rigorous formulation for the Pierce–Birkhoff conjecture on piecewise-polynomial functions.. He also made important contributions to the theory of median algebras.. In geometric graph theory, Isbell was the first to prove the bound χ ≤ 7 on the Hadwiger–Nelson problem, the question of how many colors are needed to color the points of the plane in such a way that no two points at unit distance from each other have the same color.. See also *Isbell conjugacy References External resources =Mathematical Reviews= Pseudonyms used by Isbell (and other mathematicians): 1930 births 2005 deaths 20th-century American mathematicians 21st-century American mathematicians Category theorists Game theorists Topologists University of Chicago alumni Princeton University alumni University of Washington faculty Case Western Reserve University faculty University at Buffalo faculty American operations researchers Lattice theorists Mathematicians from Oregon "
"Francesco Stefani (January 23, 1923 in Offenburg - November 11, 1989 in Munich) was a German film director of Italian descent. Stefani lived in the Federal Republic of Germany and worked in the 1950s, mainly at children's film productions. He became famous with the film The Singing Ringing Tree, for which he led as a guest at the DEFA (GDR) Director. In 1980 he was awarded the Federal Cross of Merit, in 1983 the Bavarian Order of Merit. External links 1923 births 1989 deaths Film directors from Baden-Württemberg People from Offenburg German people of Italian descent Recipients of the Cross of the Order of Merit of the Federal Republic of Germany Recipients of the Bavarian Order of Merit "
"Centennial Park is one of four parks located along the Mississippi River in downtown Davenport, Iowa, United States. The other three are LeClaire Park, which is immediately to the east of Centennial Park, Veterans Memorial Park, which is being developed immediately to the west, and River Heritage Park that is under development on the far east side of downtown. Development of the park was begun in 2000. Its name is derived from the Rock Island Centennial Bridge, which is on the east side of the park. Centennial Park features a boat ramp, a playground, a gazebo, fishing areas, a dog off leash area, basketball courts, a sprayground, and a skateboard park. The skate board park is used for skateboarding, roller blades and BMX bikes. The Riverfront Parkway passes through the park, and the River’s Edge, an indoor sports complex operated by Davenport Parks and Recreation, is on the northeast corner of the park. History The site where Centennial Park now sits is a former landfill used by the city of Davenport until 1975. The north part of the property was the location of a rail yard and the southern portion was used as a festival ground in the late 20th century, with a few commercial buildings on the west side of the property. The park's construction was a part of a $100 million project called River Vision that was passed by the city council in 2004. The skate board park was the first element of the park that opened in 2006. It was designed by SITE Design Group Inc., of Tempe, Arizona. The basketball courts, concession stand and stage were opened in 2009. The last three commercial buildings on the site were torn down the same year to make way for the spraypark that was constructed in 2010. In late 2010 and early 2011 part of what was the festival grounds was paved for parking and the rest is being seeded for an open green space. References Parks in Davenport, Iowa Protected areas on the Mississippi River "