Deleuze calls Spinoza the “Prince” of philosophers. He devotes two books to him, Spinoza et le probleme de l'expression and Spinoza. Philosophie pratique But Deleuze's entire body of work also gives him an opportunity to work on Spinoza's conceptuality. Deleuze does not arrive at Spinoza by making a leap from the principle of reason to reconquer an original and forgotten past. The immanence of Spinoza is more like an arrow found inadvertently and shot again into the immensity of the universe. We propose to define this timelessness by highlighting the main points of convergence between Deleuze's thought and that of Spinoza. These convergences will be examined using excerpts selected from the five parts of the Ethics in which the following themes will be broached: the principle of reason, panpsychism, experimentation of the body, notion of power, and liberty. We will see how Deleuze gives a new and yet strangely faithful spin to Spinozist thought on which he establishes his notions of pluricosmism, non-human becomings, ethology, deterritorialization, and escape lines.

This article discusses several recent interpretations of Frege's philosophy of arithmetic, particularly those developed by C. Wright, M. Dummett, and G. Boolos. After proposing a new interpretation of § 10 of the Grundgesetze (about the indeterminacy of the referents of the names of the courses-of-values), and rejecting Dummett's analysis of Frege's failure in terms of impredicativity, I examine Boolos's objections to the analyticity of “Hume's Principle.” I wish to highlight the philosophical question: is the model-theoretical concept of validity adequate to the “intuitive notion” of the logically true?