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.