“…Nevanlinna theory has applications and analogies in many different fields of mathematics, such as differential equations [27,34,62,40,79], difference equations [121,128,129] number theory [98,99,115,127], Brownian motion [18] and even mathematical logic [60]. Recently, there has been increasing interest in applying Nevanlinna theory to study meromorphic solutions of complex difference equations [20,21,48,58,67,80], and in particular, to detect integrability in discrete equations [1,49,50,111].…”