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    • CommentRowNumber1.
    • CommentAuthorUrs
    • CommentTimeOct 8th 2012
    • (edited Oct 8th 2012)

    I have touched the formatting at free groupoid. Then I added the statement that the fundamental groups of a free groupoid are free. Also added a pointer to a writeup of the proof.

    • CommentRowNumber2.
    • CommentAuthorzskoda
    • CommentTimeOct 9th 2012

    Just unimportant question: is there an analogue of Fox derivative for free groupoids considered anywhere (Fox derivative is originally defined for group algebras of free groups) ?

    • CommentRowNumber3.
    • CommentAuthorTim_Porter
    • CommentTimeOct 9th 2012

    Yes. Ronnie, with Phil Higgins did something on those lines and I think it is in the triple authored book.

    • CommentRowNumber4.
    • CommentAuthorronniegpd
    • CommentTimeJun 24th 2015
    • (edited Jun 24th 2015)
    The question concerns the relation between crossed complexes and chain complexes with a groupoid of operators which is fully discussed
    in the book partially titled "Nonabelian Algebraic Topology". See Sections 7.4, 8.4, 9.5.
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