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• 11:25, 16 October 2026 Rongzhou talk contribs created page Function (Created page with "A '''function''' is a many-to-one map between two sets. == Formal definition == Let $D,R \neq \emptyset$ be sets. If $$ \forall x \in D: \exists y \in R, f(x)=y $$ Then $f$ is a function of '''domain''' $D$ and '''range''' $R$, noted as $f: D \to R$. '''Example''': $$ f(x)=2x^2, x \in \mathbb{C} $$ is a function, where $f: \mathbb{C} \to \mathbb{C}$")