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3 years ago
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self.play(Write(Tex(r'''$ \Delta(W) = \left\{ \begin{array}{ll} 0 & \quad \text{if} \, s \notin W, t \notin W \\ \Phi_{\text{tot}}(F) & \quad \text{if} \, s \in W, t \notin W \\ -\Phi_{\text{tot}}(F) & \quad \text{if} \, s \notin W, t \in W \\ 0 & \quad \text{if} \, s \in W, t \in W \end{array} \right. $''')))
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