Local and global moves on locally planar trivalent graphs, lambda   calculus and $\lambda$-Scale
  We give a description of local and global moves on a class of locally planar trivalent graphs and we show that it contains $\lambda$-Scale calculus, therefore in particular untyped lambda calculus. Surprisingly, the beta reduction rule comes from a local "sewing" transformation of trivalent locally planar graphs. 
Marius Buliga
cs.LO math.GT math.LO