MathILy is an intensive residential summer program for mathematically excellent secondary students. Five weeks of maximized mathematical marvelousness where students explore and create mathematics. In MathILy classes, instructors provide the framework and students make and prove conjectures. Students will encounter new ideas, improve problem-solving skills, learn advanced mathematics, and hone thinking skills. The program is designed for students with insatiable curiosity about mathematics who are creative and enthusiastic in their approaches to learning. Participants come from all over the United States and sometimes the world. Duration: June 28 - August 1, 2026 (5 weeks). Partial attendance may be negotiated.