While students can jump directly into subjects like 18.100 or 18.701, the MIT Mathematics Department highlights 18.090 as a strategic choice for those desiring a more gradual introduction to mathematical rigor . It focuses less on specific application and more on the about mathematical connections. Mathematics (Course 18) | MIT Course Catalog
P-sets are released weekly and typically contain 6–8 problems. The first problem is usually a "warm-up" (build a truth table). The last problem is a "challenge" (a non-trivial proof from number theory or combinatorics). MIT students report spending 6–10 hours per week on the 18.090 p-set alone. The key rule: No collaboration on the final two problems. You must stand alone with your reasoning. 18.090 introduction to mathematical reasoning mit