About

HCSSiM is an intensive six-week residential mathematics program for talented high school students, hosted at Hampshire College in Massachusetts. Since its founding in 1971, the program has operated under the banner of “doing mathematics, not simply learning results.” Participants spend mornings in interactive workshops on advanced topics selected by faculty, followed by maxi-courses and rotating mini-courses in areas such as combinatorics, number theory, graph theory, topology, dynamical systems, fractals, and four-dimensional geometry. The program is ungraded and non-credit, emphasizing creative problem-solving, curiosity, and mathematical discovery.

HCSSiM does not publish an official acceptance rate, but it draws a national and international applicant pool of students who are unusually focused on mathematics and capable of sustained abstract reasoning. The application requires a letter of motivation, a “sponsor” teacher recommendation, and the program’s distinctive “Interesting Test,” a set of open-ended problems used to assess mathematical thought process and creativity rather than formal training. Prior experience with advanced mathematics is strongly recommended, and applicants are typically rising juniors or seniors, though younger students with exceptional preparation may apply. Substantial need-based financial aid is available.

Students live on the Hampshire College campus for the full six weeks, with mornings spent in multi-hour classes and evenings dedicated to problem sessions, informal discussions, and the program’s signature weekly “Prime Time Theorem” talks delivered by faculty and visiting mathematicians. Afternoons provide time for rest, recreation, or field trips. Workshops and mini-courses allow participants to shape parts of their academic schedule, and faculty and students dine, work, and interact in a shared residential community that mirrors aspects of collegiate mathematical life.

Although HCSSiM is not structured as a formal research internship, its depth, duration, and expectation of active mathematical engagement set it apart from standard enrichment programs. Students gain comfort with abstraction, extended problem-solving, and collaborative mathematical reasoning. Within selective STEM admissions, HCSSiM is widely regarded as a serious signal of advanced preparation and intellectual maturity, reflecting the program’s long history and the strength of its alumni network, which includes Nobel laureates, MacArthur Fellows, and leading mathematicians — a rare pedigree for a high-school summer program.

Thanks to its six-week duration, advanced curriculum, and historic legacy, HCSSiM stands at the highest tier of selective mathematics immersion experiences.