# Omega Calculator v1.2 (based on Omega Library 1.2, August, 2000):
# R := {[1,1]} union {[3,3]};
# 
# R;

{[1,1]} union
 {[3,3]}

# 
# hull R;

{[In_1,In_1]: 1 <= In_1 <= 3}

#