Nikola Veselinov, a 17-year-old Bulgarian mathematics prodigy from Sofia, developed a groundbreaking new theorem. He proved that certain meromorphic equations f(x)=af(x) = af(x) = a cannot be solved using elementary functions when the function has infinitely many critical values. Combining topology, symmetry, and Galois theory, his work generalizes classic unsolvability results. At Regeneron ISEF 2026, the 17-year-old won the $75,000 Young Scientist Award and first place in Mathematics. This historic achievement for Bulgaria highlights his exceptional contributions to pure mathematics as a high school student.