Celebratio Mathematica

I. M. Sing­er and J. A. Thorpe: “The curvature of 4-di­men­sion­al Ein­stein spaces,” pp. 355–​365 in Glob­al ana­lys­is: Pa­pers in hon­or of K. Kodaira. Edi­ted by D. C. Spen­cer and S. Iy­anaga. Prin­ceton Uni­versity Press, 1969. MR 256303 Zbl 0199.​25401 incollection

L. A. Coburn, R. G. Douglas, and I. M. Sing­er: “An in­dex the­or­em for Wien­er–Hopf op­er­at­ors on the dis­crete quarter-plane,” J. Diff. Geom. 6 : 4 (1972), pp. 587–​593. This is­sue is ded­ic­ated to S. S. Chern and D. C. Spen­cer on their six­tieth birth­days. MR 321142 Zbl 0252.​47026 article

D. B. Ray and I. M. Sing­er: “Ana­lyt­ic tor­sion,” pp. 167–​181 in Par­tial dif­fer­en­tial equa­tions (Berke­ley, CA, 9–27 Au­gust 1971). Edi­ted by D. C. Spen­cer. Pro­ceed­ings of Sym­po­sia in Pure Math­em­at­ics 23. Amer­ic­an Math­em­at­ic­al So­ci­ety (Provid­ence, RI), 1973. MR 339293 Zbl 0273.​58014 incollection

I. M. Sing­er: “Re­cent ap­plic­a­tions of in­dex the­ory for el­lipt­ic op­er­at­ors,” pp. 11–​31 in Par­tial dif­fer­en­tial equa­tions (Berke­ley, CA, 9–27 Au­gust 1971). Edi­ted by D. C. Spen­cer. Pro­ceed­ings of Sym­po­sia in Pure Math­em­at­ics 23. Amer­ic­an Math­em­at­ic­al So­ci­ety (Provid­ence, RI), 1973. MR 341538 Zbl 0293.​58013 incollection