Algebraic entropy, symmetries and linearization of quad equations   consistent on the cube
  We discuss the non autonomous nonlinear partial difference equations belonging to Boll classification of quad graph equations consistent around the cube. We show how starting from the compatible equations on a cell we can construct the lattice equations, its B\"acklund transformations and Lax pairs. By carrying out the algebraic entropy calculations we show that the $H^4$ trapezoidal and the $H^6$ families are linearizable and in a few examples we show how we can effectively linearize them. 
Giorgio Gubbiotti, Christian Scimiterna and Decio Levi
nlin.SI math-ph math.MP