Celebratio Mathematica

S. Mac Lane: “Why com­mut­at­ive dia­grams co­in­cide with equi­val­ent proofs,” pp. 387–​401 in Al­geb­ra­ists’ homage: Pa­pers in ring the­ory and re­lated top­ics (New Haven, CT, 2–5 June 1981). Edi­ted by D. Amit­sur, J. Salt­man, and G. B. Se­lig­man. Con­tem­por­ary Math­em­at­ics 13. Amer­ic­an Math­em­at­ic­al So­ci­ety (Provid­ence, RI), 1982. Presen­ted in hon­or of Nath­an Jac­ob­son. MR 685975 Zbl 0504.​18004 incollection