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 $T_Y$.