I started writing a “need help” post but I found it out how to do writing
I needed to check that the difference between two prices is higher than 0.01.
PriceA - PriceB > 0.01 gives a wrong result if PriceA < PriceB.
As there is no “:absolute” function, square can be used : PriceA - PriceB ^2 ^0.5
But (5.00 - 5.01)^2 ^0.5 gives something like 0.010001, which is > 0.01, because of the rounding in the calculation
so use a higher limit such as (PriceA - PriceB)^2 ^0.5 > 0.0101