Let $q$ be a variable instead of a complex number$number, write$q=1+t$with$t$also a variable, and complete with respect to the$t$-adic topology. This gives you a formal deformation of the coordinate algebra of the sphere in the sense of Gerstenhaber---this is not tautological: it follows from the fact that the deformation is flat. 1 Let$q$be a variable instead of a complex number$, write $q=1+t$ with $t$ also a variable, and complete with respect to the $t$-adic topology. This gives you a formal deformation of the coordinate algebra of the sphere in the sense of Gerstenhaber---this is not tautological: it follows from the fact that the deformation is flat.