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(< <x1> <x2> <3> …) returns #t if the arguments are monotonically increasing, #f otherwise. Using it on inexact arguments may be unreliable because a small inaccuracy may affect the result. At least 2 parameters are required.

Example:

[1] (< 1 2)
#t
[2] (< 10.0 9.0)
#f
[3] (< 2.0 3 4.1)
#t
[4]