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charset=utf-8 Content-Transfer-Encoding: quoted-printable
Was he referring to the paper =E2=80=9CTensor products of abelian grou= ps=E2=80=9D, cited in this discussion? https://mat= hoverflow.net/questions/287869/history-of-natural-transformations

I don=E2=80=99t have access to it either, but it=E2=80=99s on Scribd:&= nbsp;https://www.scribd.com/document/172981416/Hassler-Whitne= y-Tensor-Products-of-Abelian-Groups

The terms =E2=80=9Cnatural isomorphism=E2=80=9D and =E2=80=9Cnatural h= omomorphism=E2=80=9D are used on pages 500-501, and these do turn out to be= natural transformations, but it=E2=80=99s not obvious that he intended to = explicitly define a new formal concept.

Wesley

Sent from my iPad

On Dec 18, 2023, at 10:00=E2=80=AFAM, Michael Bar= r, Prof. <barr.michael@mcgill.ca> wrote:

=EF=BB=BF
Peter Freyd claims that Hassler Whitney defined natural transformation in a= 1938 paper.  I no longer have access to Math. Reviews (except by goin= g to McGill, which I have done only once in the last four years) so I canno= t supply a reference.

Michael
 
 
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