"Testing numerator"

clear

T = numerator(2/3)
check(T = 2) 
T = numerator(x)
check(T = x) 
T = numerator(1/x)
check(T = 1) 
T = numerator(a+b)
check(T = a+b) 
T = numerator(1/a+1/b)
check(T = a+b)
