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Knoten und Gruppen

https://doi.org/10.1007/bf02952506
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The 9 references without a DOI — listed, not checked
no DOI — not checkedEin Teil dieser Arbeit wurde im Januar 1926 in Hamburg vorgetragen.
no DOI — not checkedM. Dehn, Math. Ann. 69, S. 153-159.
no DOI — not checkedO. Schreier, Hamb. Abhdl., III, S. 167-169.
no DOI — not checked-H. Tietze, Mon. f. Math. u. Phys., XIX. Jahrg., S. 56-65; W.v. Dyck, Math. Ann., XX,. S. I ff.
no DOI — not checkedDie Kennzeiehnung der Gruppeneigensehaften, an die hier erinnert wird, wird erat in der uaehstehenden Arbeit ‘Elementare Begründung...’ benutzt.
no DOI — not checkedHomomorph wird im Sinne von mehrstufig-isomorph gebraueht.
no DOI — not checkedDie Bedeutung des Verfahrens wird durch § 3 Nr. 1 und 2 erhellt. Daselbst wird man auch erkennen, daß sich in manchen Fällen auch nicht-ausgezeichnete Untergruppen ganz ähnlich aufstellen lassen.
no DOI — not checkedE. Artin, Hamb. Abhdl. IV, S. 57-62. Diese Herleitung geht auf W. Wirtinger zurück.
no DOI — not checkedZur Konstruktion der Fundamentalgruppen einer Mannigfaltigkeit vgl. H. Tietze, a.a. O.S. 65-77.
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