Contents: Introduction: Spinoza and the problem of expression; Spinoza from the point of view of an idealist or a materialist dialectic; The differential point of view of the infinitesimal calculus; The metaphysics of the calculus: extensive quantity; From Scotist univocity to Spinozist immanence: intensive quantity; The distinction between intensive and extensive parts; Spinoza’s theory of relations; The transformation of the characteristic relations of modal existence; The mechanics of joyful passive affections; The distinction between the duration of a finite existing mode and its eternity; The logic of expression and the construction of a philosophy of difference; Conclusion: expressionism in philosophy; Bibliography; Index.