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nLab > Latest Changes: Lambek's theorem; natural numbers

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    • CommentRowNumber1.
    • CommentAuthorTodd_Trimble
    • CommentTimeNov 16th 2009
    Added to initial algebra the proof of Lambek's theorem, that the algebra structure of an initial algebra is an isomorphism. Also added to natural numbers object Freyd's finite colimit characterization in a topos, with a partial proof of same.

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