據說是ARML的問題...
Let S = {f(k) | f(1)=i,f(2)=j,f(n+2)=f(n+1)+f(n) for all n belongs to N}
i,j
i<j, i,j belongs to N
Could N be partitioned by infinite S ?
i,j
即存在無限個S，彼此之間交集為空集合，聯集為所有自然數
Ex: S = {2,5,7,12,19,...}
2,5