# Omega Calculator v1.2 (based on Omega Library 1.2, August, 2000):
# Symbolic n, f(1), f_last, f_first;
# 
# 
# True := { [] : 1 = 1 };
# 
# 
# old_R1 := { [x] -> [] : (1 <= x <= n and f(x) > 0)};
# 
# old_R2 := { [x] -> [] : (1 <= x <= n and f(x) <=0)};
# 
# True - range old_R1 - range old_R2;

{ 1 <= n && UNKNOWN} union
 { n <= 0}

# 
# 
# R1 := { [x] -> [] : (3 <= x <= n-1 and f(x) > 0)
# 		 or (1 <= n and f_last > 0)
# 		 or (1 <= n and f_first > 0) };
# 
# R2 := { [x] -> [] : (3 <= x <= n-1 and f(x) <=0)
# 		 or (1 <= n and f_last <=0)
# 		 or (1 <= n and f_first <=0) };
# 
# True - range R1 - range R2;

{ n <= 0}

# 
# 
# R1a := { [x] -> [] : (1 <= x <= n and (f(x) > 0 or f_first > 0 or f_last > 0)) };
# 
# R2a := { [x] -> [] : (1 <= x <= n and (f(x) <=0 or f_first <=0 or f_last <=0)) };
# 
# True - range R1a - range R2a;

{ f_last <= 0 && n <= 0} union
 { n <= 0 && 1 <= f_last}

#