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[!definition] Définition
T \vdash x =x
T \vdash (x = y) \to (y = x)
T \vdash (x = y) \wedge (y = z) \to (x = z)
T \vdash (x_1 = y_1 \wedge \dots \wedge x_{n} = y_{n}) \to f^definition