Unlimited intervals

If at least one of the two interval limits is plus or minus infi­nite, it is an example of an un­limi­ted inter­val.

As the infinity character is rather difficult to produce using the keyboard, infinite interval limits are expressed in LF‑ET by Inf (for Infinite, Infinity):

‑Inf

negatively infinite, for the lower interval limit

 Inf

positively infinite, for the upper interval limit

Infinite interval limits are always exclusive

] -Inf : …​

ok

[ -Inf : …​

wrong

…​ : Inf [

ok

…​ : Inf ]

wrong

Sample unlimited intervals

Interval entry

Corresponds to

] ‑Inf : 10,000 ]

<= 10,000

] -Inf : 10,000 [

< 10,000

] 2,000 : Inf [

> 2,000

[ 2,000 : Inf [

>= 2,000