Les pr\'e-(a,b)-alg\`ebres \`a homotopie pr\`es
  We study in this article the concept of algebra up to homotopy for a structure defined by two operations . Important examples of such structure are those of pre-Gerstenhaber and pre-Poisson algebras. Given a structure of pre-commutative and pre-Lie algebra for two shifts of degree given by a and b, we define the structure of a pre-(a, b)-algebra and we give an explicit construction of the associated algebra up to homotopy. 
Walid Aloulou (MAPFSA)
math.QA