Let $V$ and $W$ be vector spaces and $T: V \to W$ be linear transformation, then
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A quick way to check if a transformation is linear is to evaluate it at the zero vector.
If \( T(\mathbf{0}_V) \neq \mathbf{0}_W \), the transformation is not linear (e.g., translation mappings like \( T(x) = x + 3 \)).