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1975 in science
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==Mathematics== * [[Benoit Mandelbrot]] coins the term ''[[fractal]]''. * The [[Harada–Norton group]] is discovered.<ref>{{cite conference|last=Harada|first=Koichiro|title=Proceedings of the Conference on Finite Groups (Univ. Utah, Park City, Utah, 1975)|publisher=[[Academic Press]]|location=Boston, MA|mr=0401904|year=1976|chapter=On the simple group F of order <math>2^{14}\cdot 3^{6}\cdot 5^{6}\cdot 7\cdot 11\cdot 19</math>|pages=119–276}}</ref><ref>{{cite book|first=Simon P.|last=Norton|title=F and other simple groups|publisher=PhD Thesis|location=University of Cambridge|year=1975}}</ref> * [[John N. Mather]] and [[Richard McGehee]] prove that for the Newtonian collinear four-body problem there exist solutions which become unbounded in a finite time interval.<ref>{{cite book|author1=Mather, J. N. |author2=McGehee, R. |chapter=Solutions of the collinear four body problem which become unbounded in finite time |title=Dynamical Systems, Theory and Applications|volume=38|year=1975|pages=573–597|doi=10.1007/3-540-07171-7_18|series=Lecture Notes in Physics |bibcode=1975LNP....38..573M |isbn=978-3-540-07171-6 }}</ref><ref>{{cite journal|url=https://www.ams.org/notices/199505/saari-2.pdf|author=Saari, Donald G.|author2=Xia, Zhihong (Jeff)|title=Off to infinity in finite time|journal=[[Notices of the American Mathematical Society]]|year=1995|volume=42|issue=5}}</ref><ref>{{Cite journal|first=Alain|last=Chenciner|title=The three body problem|volume=2|issue=10|pages=2111|year=2007|journal=Scholarpedia|doi=10.4249/scholarpedia.2111|bibcode=2007SchpJ...2.2111C|doi-access=free}}</ref> * The [[Monty Hall problem]] in [[probability]] is first posed, by [[Steve Selvin]].<ref>{{cite journal|last=Selvin|first=Steve|title=A problem in probability (letter to the editor)|journal=[[The American Statistician]]|volume=29|issue=1|pages=67–71|date=February 1975|doi=10.1080/00031305.1975.10479121 }}</ref><ref>{{cite journal|last=Selvin|first=Steve|title=On the Monty Hall problem (letter to the editor)|journal=American Statistician|volume=29|issue=3|page=134 |date=August 1975}}</ref>
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