LessEqual does some simplification when its arguments are not numbers.
For exact numeric quantities, LessEqual internally uses numerical approximations to establish numerical ordering. This process can be affected by the setting of the global variable $MaxExtraPrecision.
can be entered as 
Esc <= Esc 
or x\[LessEqual]y. 
, entered as 
Esc </ Esc 
or x\[LessSlantEqual]y, can be used on input as an alternative to 
. 
EXAMPLES
Basic Examples 
Scope 