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Y must be numeric. X must be numeric. R is Boolean. R is 1 if X is greater than Y and X=Y is 0. Otherwise R is 0.
⎕CT and ⎕DCT are implicit arguments of Greater.
1 2 3 4 5 > 2 0 0 1 1 1 ⎕CT←1E¯10 1 1.00000000001 1.000000001 > 1 0 0 1