Rigid gems in dimension n
  We extend to dimension $n \geq 3$ the concept of $\rho$-pair in a coloured graph and we prove the existence theorem for minimal rigid crystallizations of handle-free, closed $n$-manifolds. 
Paola Bandieri and Carlo Gagliardi (Universit\`a degli Studi di Modena   e Reggio Emilia)
math.GT