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Benjamin Dickman
Benjamin Dickman
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CW since some of the recent posts on MO have required little more than googling.

Prior to the book you mentioned, MacLane attributed this saying to Peter Freyd in:

MacLane, S. (1965). Categorical algebra. Bulletin of the American Mathematical Society, 71(1), 40-106.

Relevant excerpt: (p. 48)

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The only citation of Freyd in that piece (P. FreydWith regard to the original language, Eric Wofsey points out that Freyd's Relative homological algebra made absolute, Proc. Nat. Acad. Sci. U.S.A. 49Abelian Categories (1963), 19-201964) does not appear to be the source ofbegins with this quotation (if you can call it that) so the true origin may have to remain unknown.description:

enter image description here

CW since some of the recent posts on MO have required little more than googling.

Prior to the book you mentioned, MacLane attributed this saying to Peter Freyd in:

MacLane, S. (1965). Categorical algebra. Bulletin of the American Mathematical Society, 71(1), 40-106.

Relevant excerpt: (p. 48)

enter image description here

The only citation of Freyd in that piece (P. Freyd, Relative homological algebra made absolute, Proc. Nat. Acad. Sci. U.S.A. 49 (1963), 19-20) does not appear to be the source of this quotation (if you can call it that) so the true origin may have to remain unknown.

CW since some of the recent posts on MO have required little more than googling.

Prior to the book you mentioned, MacLane attributed this saying to Peter Freyd in:

MacLane, S. (1965). Categorical algebra. Bulletin of the American Mathematical Society, 71(1), 40-106.

Relevant excerpt: (p. 48)

enter image description here

With regard to the original language, Eric Wofsey points out that Freyd's Abelian Categories (1964) begins with this description:

enter image description here

Source Link
Benjamin Dickman
Benjamin Dickman
  • 7.8k
  • 2
  • 47
  • 89

CW since some of the recent posts on MO have required little more than googling.

Prior to the book you mentioned, MacLane attributed this saying to Peter Freyd in:

MacLane, S. (1965). Categorical algebra. Bulletin of the American Mathematical Society, 71(1), 40-106.

Relevant excerpt: (p. 48)

enter image description here

The only citation of Freyd in that piece (P. Freyd, Relative homological algebra made absolute, Proc. Nat. Acad. Sci. U.S.A. 49 (1963), 19-20) does not appear to be the source of this quotation (if you can call it that) so the true origin may have to remain unknown.

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