Celebratio Mathematica

I. Ka­plansky: “Nor­mal an­ti­lin­ear op­er­at­ors on a Hil­bert space,” pp. 379–​385 in Al­geb­ra­ists’ homage: Pa­pers in ring the­ory and re­lated top­ics (New Haven, CN, 2–5 June, 1981). Edi­ted by S. A. Amit­sur, D. J. Salt­man, and G. B. Se­lig­man. Con­tem­por­ary Math­em­at­ics 13. Amer. Math. Soc. (Provid­ence, RI), 1982. Con­fer­ence in hon­or of Nath­an Jac­ob­son. MR 685974 Zbl 0514.​47016