The discussion centers on the search for a contemporary mathematics book that outlines basic axioms and derives concepts from them, akin to Euclid's Elements. The initial suggestion is Russell and Whitehead's "Principia Mathematica," but it is met with strong criticism for its density and perceived irrelevance to practical mathematics. Instead, the conversation shifts to recommending more accessible texts focused on specific mathematical topics, particularly Category and Topos Theory. Two suggested books are "Topoi: The Categorial Analysis of Logic" by Richard Goldblatt and "Toposes and Local Set Theories: An Introduction" by John Bell, both praised for their affordability and rigor. However, caution is advised for readers without extensive training in rigorous thinking, as the material may seem abstract.