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  1. Page created, but author did not leave any comments.

    Anonymous

    v1, current

    • CommentRowNumber2.
    • CommentAuthorTodd_Trimble
    • CommentTimeJun 16th 2021

    Replaced the wrong sentence that the real numbers form a terminal archimedean group.

    diff, v5, current

    • CommentRowNumber3.
    • CommentAuthorTodd_Trimble
    • CommentTimeJun 16th 2021

    Replaced the wrong sentence that the real numbers form a terminal archimedean group.

    diff, v5, current

    • CommentRowNumber4.
    • CommentAuthorDmitri Pavlov
    • CommentTimeJun 16th 2021

    The claim appears to be repeated at real number:

    Alternatively, an archimedean group is terminal if it is the terminal object in the category of archimedean groups.

    • CommentRowNumber5.
    • CommentAuthorDavidRoberts
    • CommentTimeJun 16th 2021

    Hmm, this doesn’t make sense

    The positive integers are embedded into the function group AAA\to A

    unless I assume that AAA\to A is automorphisms of AA. That is, unless AA is abelian, somehow forced by the linearity of the ordering on AA.

    • CommentRowNumber6.
    • CommentAuthorTodd_Trimble
    • CommentTimeJun 16th 2021

    The Wikipedia article on archimedean groups does say that they’re abelian, but perhaps you’re right perhaps in that this ought to be said first. Perhaps some clean-up is in order.

    • CommentRowNumber7.
    • CommentAuthorGuest
    • CommentTimeJun 18th 2021

    Todd wrote:

    Replaced the wrong sentence that the real numbers form a terminal archimedean group

    Is that because, unlike in the case for fields, the trivial group can be trivially made into a linearly ordered group by declaring 0Unknown character00 < 0 to be false? So the terminal archimedean group would just be the trivial group?

    • CommentRowNumber8.
    • CommentAuthorTodd_Trimble
    • CommentTimeJun 18th 2021

    Yes, of course.

    Consider also that there are many maps of archimedean groups from \mathbb{Z} to \mathbb{R}. In order for \mathbb{R} to be terminal, you’d need exactly one.

  2. moved material on the Archimedean property in general to its own page Archimedean property

    Anonymous

    diff, v11, current