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Born in Frankfurt am Main to an "affluent and cultured Jewish family." His father was Moritz Nathan Oppenheim. Rescher, Nicholas. "H2O: Hempel-Helmer-Oppenheim, an Episode in the History of Scientific Philosophy in the 20th Century." Philosophy of Science, Vol. 64, No.2 (Jun, 1997): 334-360. https://www.jstor.org/stable/188313.
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Doctorate in chemistry after studying chemistry and philosophy at Freibury and Giessen. Rescher, Nicholas. "H2O: Hempel-Helmer-Oppenheim, an Episode in the History of Scientific Philosophy in the 20th Century." Philosophy of Science, Vol. 64, No.2 (Jun, 1997): 334-360. https://www.jstor.org/stable/188313.
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Married Gabrielle Errera. Rescher, Nicholas. "H2O: Hempel-Helmer-Oppenheim, an Episode in the History of Scientific Philosophy in the 20th Century." Philosophy of Science, Vol. 64, No.2 (Jun, 1997): 334-360. https://www.jstor.org/stable/188313.
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Contact began with Reichenbach who later helped to write Oppenheim's two monographs. Rescher, Nicholas. "H2O: Hempel-Helmer-Oppenheim, an Episode in the History of Scientific Philosophy in the 20th Century." Philosophy of Science, Vol. 64, No.2 (Jun, 1997): 334-360. https://www.jstor.org/stable/188313.
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President of powerful German chemical conglomerate. Rescher, Nicholas. "H2O: Hempel-Helmer-Oppenheim, an Episode in the History of Scientific Philosophy in the 20th Century." Philosophy of Science, Vol. 64, No.2 (Jun, 1997): 334-360. https://www.jstor.org/stable/188313.
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Philosophical monograph, "Fundamental principles of a comparative science of the sciences." Rescher, Nicholas. "H2O: Hempel-Helmer-Oppenheim, an Episode in the History of Scientific Philosophy in the 20th Century." Philosophy of Science, Vol. 64, No.2 (Jun, 1997): 334-360. https://www.jstor.org/stable/188313.
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Philosophical monograph, "Fundamental principles of scientific concept-formation." Rescher, Nicholas. "H2O: Hempel-Helmer-Oppenheim, an Episode in the History of Scientific Philosophy in the 20th Century." Philosophy of Science, Vol. 64, No.2 (Jun, 1997): 334-360. https://www.jstor.org/stable/188313.
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Moved from Germany to Brussels in Belgium during the rise of the Nazi power. Rescher, Nicholas. "H2O: Hempel-Helmer-Oppenheim, an Episode in the History of Scientific Philosophy in the 20th Century." Philosophy of Science, Vol. 64, No.2 (Jun, 1997): 334-360. https://www.jstor.org/stable/188313.
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Hempel joined Oppenheim in Brussels who original met in Berlin in the 1920's. They later wrote a book on the logic of classification. Rescher, Nicholas. "H2O: Hempel-Helmer-Oppenheim, an Episode in the History of Scientific Philosophy in the 20th Century." Philosophy of Science, Vol. 64, No.2 (Jun, 1997): 334-360. https://www.jstor.org/stable/188313.
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Grelling and Oppenheim met and both investigated the gestalt concept. Rescher, Nicholas. "H2O: Hempel-Helmer-Oppenheim, an Episode in the History of Scientific Philosophy in the 20th Century." Philosophy of Science, Vol. 64, No.2 (Jun, 1997): 334-360. https://www.jstor.org/stable/188313.
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Moved from Germany to Princeton when war started in Europe. Rescher, Nicholas. "H2O: Hempel-Helmer-Oppenheim, an Episode in the History of Scientific Philosophy in the 20th Century." Philosophy of Science, Vol. 64, No.2 (Jun, 1997): 334-360. https://www.jstor.org/stable/188313.
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Kurt Grelling and Paul Oppenheim wrote "Concerning the Structure of Wholes" published in the Philosophy of Science. Grelling, Kurt and Paul Oppenheim. "Concerning the Structures of Wholes." Philosophy of Science Volume 6, Number 4 (1939). https://www.journals.uchicago.edu/doi/pdfplus/10.1086/286594
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Kurt Grelling and Paul Oppenheim wrote "Logical Analysis of "Gestalt" as "Functional Whole" published in the Journal of Symbolic Logic. "Logical Analysis of "Gestalt" as "Functional Whole"." Journal of Symbolic Logic 4(4) (1939): 169-170. https://philpapers.org/rec/GRELAO-4.
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Hempel and Oppenheim joint paper. Rescher, Nicholas. "H2O: Hempel-Helmer-Oppenheim, an Episode in the History of Scientific Philosophy in the 20th Century." Philosophy of Science, Vol. 64, No.2 (Jun, 1997): 334-360. https://www.jstor.org/stable/188313.
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Carl Hempel and Paul Oppenheim wrote "Studies in the Logic of Explanation" published in the Philosophy of Science. Hempel, Carl and Paul Oppenheim. "Studies in the Logic of Explanation." Philosophy of Science Volume 15 Number 2 (1948): 135-175. http://links.jstor.org/sici?sici=0031-8248%28194804%2915%3A2%3C135%3ASITLOE%3E2.0.CO%3B2-E
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Nicholas Rescher and Paul Oppenheim wrote "Logical Analysis of Gestalt Concepts" which was published in the British Journal for the Philosophy of Science. Rescher, Nicholas. "H2O: Hempel-Helmer-Oppenheim, an Episode in the History of Scientific Philosophy in the 20th Century." Philosophy of Science, Vol. 64, No.2 (Jun, 1997): 334-360. https://www.jstor.org/stable/188313.
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Oppenheim's death in Princeton, NJ. Rescher, Nicholas. "H2O: Hempel-Helmer-Oppenheim, an Episode in the History of Scientific Philosophy in the 20th Century." Philosophy of Science, Vol. 64, No.2 (Jun, 1997): 334-360. https://www.jstor.org/stable/188313.