ThmDex – An index of mathematical definitions, results, and conjectures.
Result R3038 on D1492: Map graph
Closed graph theorem
Formulation 1
Let $T_X = (X, \mathcal{T}_X)$ and $T_Y = (Y, \mathcal{T}_Y)$ each be a D1106: Topological space such that
(i) $T_{X \times Y}$ is a D1161: Topological product space for $(T_X, T_Y)$
(ii) $f : X \to Y$ is a D18: Map
(iii) \begin{equation} \Gamma : = \{ (x, f(x)) : x \in X \} \end{equation}
(iv) $\Gamma$ is a D98: Closed set in $T_{X \times Y}$
Then $f$ is a D55: Continuous map from $T_X$ to $T_Y$.