Celebratio Mathematica

R. As­key: “A brief in­tro­duc­tion to the world of \( q \),” pp. 13–​20 in Sym­met­ries and in­teg­rabil­ity of dif­fer­ence equa­tions (Estérel, Canada, 22–29 May 1994). Edi­ted by D. Levi, L. Vinet, and P. Win­tern­itz. CRM Pro­ceed­ings & Lec­ture Notes 9. Amer­ic­an Math­em­at­ic­al So­ci­ety (Provid­ence, RI), 1996. MR 1416822 Zbl 0885.​33010 incollection