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The [[art gallery problem]], posed by [[Victor Klee]] in 1973, asks for the number of points at which to place guards inside a polygon (r ...ding [[star-shaped polygon]]s, spiral polygons, and [[monotone polygon]]s; non-simple polygons; prison yard problems, in which the guards must view the ex ...

{{Short description|Series of mathematics books by Nicolas Bourbaki}} ...English: '''''Elements of Mathematics''''') is a series of [[mathematics]] books written by the pseudonymous French collective [[Nicolas Bourbaki]]. Begun ...

...d into Spanish in 1949.<ref>{{Cite journal |last=Halmos |first=P. R. |date=1973 |title=The Legend of John Von Neumann |url=https://www.jstor.org/stable/231 # If the observable <math>R</math> is a [[Positive operator|non-negative operator]], then its expected value <math>\langle R\rangle\geq0</m ...

...wking |first=Stephen |title=My Brief History |url=https://books.google.com/books?id=PYYaAAAAQBAJ |year=2013 |publisher=Bantam |isbn=978-0-345-53528-3 |acces ...lively and witty college member, interested in classical music and science fiction.{{sfn|Ferguson|2011|p=28}} Part of the transformation resulted from his dec ...

...tion=New York}}</ref><ref>{{cite book|chapter-url=https://books.google.com/books?id=_Gs-AAAAYAAJ&q=Robert+Pullus|last=Newman|first=John Henry|chapter=The Sc ...Chris|last=Koenig|title=Oxford Past Times|location=Oxford|publisher=Signal Books|year=2013|isbn=978-1-908493-65-1}}</ref> ...

...llich Rubin]], ''Essays on Marx's theory of value''. Detroit: Black & Red, 1973.</ref> the theory of the value-form has been appraised by many Western Marx ...llich Rubin]], ''Essays on Marx's theory of value''. Detroit: Black & Red, 1973; [[Geoffrey Ingham]], ''The nature of money''. Cambridge: Polity Press, 200 ...