The < function returns the symbol TRUE if for all its arguments, argument n1 is less than argument n, otherwise it returns the symbol FALSE. Note that < compares only numeric values and will convert integers to floats when necessary for comparison.
Syntax
(< <numeric-expression> <numeric-expression>+)
Example
CLIPS> (< 3 4 5) TRUE CLIPS> (< 3 5 4) FALSE CLIPS>
See portability note in section 12.1.13.