Definition of an interval : a1..a2

An interval is represented by two real numbers separated by .., for example

1..3
1.2..sqrt(2)

Input :

A:=1..4

B:=1.2..sqrt(2)

Warning!
The order of the boundaries of the interval is significant. For example, if you input

B:=2..3; C:=3..2,

then B and C are different, B==C returns 0.