这是英文版数学分析的题,实在看不懂,求教!Suppose that f and g are functions such that g ◦ f is onto.Must g beonto?Should f be onto?(g、f是两个函数的表示~)还有那个好多题里出现onto ,

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这是英文版数学分析的题,实在看不懂,求教!Suppose that f and g are functions such that g ◦ f is onto.Must g beonto?Should f be onto?(g、f是两个函数的表示~)还有那个好多题里出现onto ,
这是英文版数学分析的题,实在看不懂,求教!
Suppose that f and g are functions such that g ◦ f is onto.Must g be
onto?Should f be onto?(g、f是两个函数的表示~)
还有那个好多题里出现onto ,

这是英文版数学分析的题,实在看不懂,求教!Suppose that f and g are functions such that g ◦ f is onto.Must g beonto?Should f be onto?(g、f是两个函数的表示~)还有那个好多题里出现onto ,
onto 满射
就是f(A)=B
A B分别是f g的定义域