A comparison using a binary operator can be, for example x<1, which returns 1 (true) if x is smaller than 1and 0 (false) otherwise. For a composite comparison such as 0 < x < 1, you can achieve it using (0<x)*(x<1). An expression like 0<x<1 is possible to use but is evaluated as (0<x)<1, which for an x in the interval is interpreted as 1<1 and thus returns 0 instead of 1 for all such value of x.