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If vec a is a vector and m is a scal...

If ` vec a` is a vector and `m` is a scalar such that `m vec a= vec0` , then what are the alternatives for `m` and ` vec a?`

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vec{ a} is vector
m is scalar
m` bar{a}=overline{0} `
`Rightarrow m=0 ` Or `bar{a}=overline{0}`
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