Editing Homotopy group (section)

== References ==
* [[Ronald Brown (mathematician)|Ronald Brown]], `Groupoids and crossed objects in algebraic topology', [[Homology, Homotopy and Applications]], 1 (1999) 1–78.
* [[Ronald Brown (mathematician)|Ronald Brown]], Philip J. Higgins, Rafael Sivera, [http://pages.bangor.ac.uk/~mas010/nonab-a-t.html Nonabelian algebraic topology: filtered spaces, crossed complexes, cubical homotopy groupoids], EMS Tracts in Mathematics Vol. 15, 703 pages, European Math. Society, Zürich, 2011. {{doi|10.4171/083}} {{MR|2841564}}
* {{citation|last=Čech|first=Eduard|author-link=Eduard Čech|title=Höherdimensionale Homotopiegruppen|journal=Verhandlungen des Internationalen Mathematikerkongress, Zürich|year=1932}}.
* {{citation|last1=Hatcher|first1=Allen|author-link=Allen Hatcher|title=Algebraic topology|url=http://pi.math.cornell.edu/~hatcher/AT/ATpage.html|publisher =[[Cambridge University Press]]|isbn=978-0-521-79540-1|year=2002}}
* {{Springer|title=Homotopy group|id=p/h047930}}
* {{citation|last=Hopf|first=Heinz|author-link=Heinz Hopf|title=Über die Abbildungen der dreidimensionalen Sphäre auf die Kugelfläche|journal=[[Mathematische Annalen]]|volume=104|issue=1|pages=637–665|year=1931|url=http://resolver.sub.uni-goettingen.de/purl?GDZPPN002274760|doi=10.1007/BF01457962|doi-access=|url-access=subscription}}.
* {{cite book|last1=Kamps|first1=Klaus H.|last2=Porter|first2=Timothy|title=Abstract homotopy and simple homotopy theory|publisher=World Scientific Publishing|location=River Edge, NJ|year=1997|isbn=981-02-1602-5|mr=1464944|doi=10.1142/9789812831989}}
* {{cite book|last=Toda|first=Hiroshi|author-link=Hiroshi Toda|title=Composition methods in homotopy groups of spheres|publisher=Princeton University Press|location=Princeton, N.J.|series=Annals of Mathematics Studies|volume=49|year=1962|isbn=0-691-09586-8|mr=0143217}}
* {{cite book|first=George William|last=Whitehead|author-link=George W. Whitehead|title=Elements of homotopy theory|url=https://books.google.com/books?id=wlrvAAAAMAAJ|edition=3rd|series=Graduate Texts in Mathematics|volume=61|year=1978|publisher=Springer-Verlag|location=New York-Berlin|isbn=978-0-387-90336-1|pages=xxi+744|mr=0516508 }}

{{Topology}}

[[Category:Homotopy theory]]

[[cs:Homotopická grupa]]