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Functional
For any vector space $X$ over a field $\mathbb{K}$, a functional is a function that eats a vectors and spits out a scalar i.e $l: X\rightarrow \mathbb{K}$
For any vector space $X$ over a field $\mathbb{K}$, a functional is a function that eats a vectors and spits out a scalar i.e $l: X\rightarrow \mathbb{K}$