Sartre’s literary and philosophical styles diverge sharply, with the philosophical prose being notably sloppy.

Evidence

In his literary and political essays, Sartre’s style is not vastly diff erent from Beauvoir’s; that is why one can well believe that she may have ghostwritten for him on occasion. In his trilogy, Th e Roads to Freedom, his style at times resembles that of her own novels in its straightforwardness and comparative absence of embellishment. … In his more strictly philosophical works, by contrast, and in particular in the Critique of Dialectical Reason, Sartre oft en achieves a sloppiness of style of which Beauvoir would simply have been ashamed. — Christine Daigle, Jacob Golomb (eds.), Beauvoir and Sartre, 528

Categorization

• XREF: Relates directly to the central Beauvoir–Sartre authorship/influence debate this volume is organized around; feeds the ghostwriting hypothesis.
• QUESTION: The ghostwriting claim is hedged here (‘one can well believe she may have’) — worth chasing the actual biographical evidence for who wrote which passages.