 In "Closures and Openings” (in "Return to Nevèrÿon"), section 15 discusses the Modular Calculus directly, for those who need a helping hand or who have not carefully pursued the notion for themselves through all the "Informal Remarks".As Delany puts it in another interview, "The Second Science Fiction Studies Interview", he quotes from "The Informal Remarks, Part II" (the second appendix to "Trouble on Triton"), "How can one relational system model another?.