The abstract group concept by the MacTutor History of Mathematics Archive (source code)

= The abstract group concept by the MacTutor History of Mathematics Archive
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Archive exposition based on a 19 March 2001 lecture by <Peter Michael Neumann>. Its account compares concrete substitutions, abstract definitions and <Heinrich Weber>'s finite cancellation axioms. The byline explains the relation between the lecture and the written notes.

Online source: https://mathshistory.st-andrews.ac.uk/HistTopics/Abstract_groups/