  In this paper we explain the parallelism in the classification of three
different kinds of mathematical objects:
  (i) Classical r-matrices.
  (ii) Generalized cohomology theories that have Chern classes for complex
vector bundles.
  (iii) 1-dimensional formal groups.
  The main point of the paper is a construction of the elliptic algebra
associated to Belavin's classical elliptic r-matrix in terms of Equivariant
elliptic cohomology of the Steinberg varieties associated to some partial flag
manifolds.
