Celebratio Mathematica

R. Bott: “Lec­tures on Morse the­ory, old and new,” pp. 3–​30 in The math­em­at­ic­al her­it­age of Henri Poin­caré (Bloom­ing­ton, IN, 7–10 April 1980), part 2. Edi­ted by F. E. Browder. Pro­ceed­ings of Sym­po­sia in Pure Math­em­at­ics 39. 1983. An ex­pan­ded and altered ver­sion of this lec­ture ap­peared in Bull. Am. Math. Soc. 7:2 (1982). See also the pa­per in Pro­ceed­ings of the 1980 Beijing sym­posi­um on dif­fer­en­tial geo­metry and dif­fer­en­tial equa­tions (1982). Zbl 0525.​58011 incollection