Let \(A \in \mathbb{R}^{2\times 3}\).
Can \(\operatorname{nullity}(A) = 0\)?
Yes
No
The answer is “No”.
Note that \(\operatorname{rank}(A)\)
cannot exceed the number of rows which in this
case is \(2\).
So by the rank-nullity theorem,
we have \[\operatorname{nullity}(A) = 3 - \operatorname{rank}(A)
\geq 3 - 2 = 1.\]