来自蔡可芬的问题
设集合A={a,b,c},B={-1,0,1},映射f:A→B满足f(a)-f(b)=f(c),求映射的个数
设集合A={a,b,c},B={-1,0,1},映射f:A→B满足f(a)-f(b)=f(c),求映射的个数
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2020-11-08 17:43
设集合A={a,b,c},B={-1,0,1},映射f:A→B满足f(a)-f(b)=f(c),求映射的个数
设集合A={a,b,c},B={-1,0,1},映射f:A→B满足f(a)-f(b)=f(c),求映射的个数
f:A->Bf(c)=1,f(a)=1,f(b)=0f(c)=1,f(a)=0,f(b)=-1f(c)=0,f(a)=0,f(b)=0f(c)=0,f(a)=-1,f(b)=-1f(c)=0,f(a)=1,f(b)=1f(c)=-1,f(a)=0,f(b)=1f(c)=-1,f(a)=-1,f(b)=0total:7个