猜一个数学名词

2025-05-10 09:56:44
推荐回答(2个)
回答1:

f is exactly onto.
for every k∈Z, we can find (k,0)∈Z×Z ,such that
f(k,0)=k-0 = k
so,f is onto

回答2:

未知数 吗?