Four Heegner Numbers Unisex Sweatshirt
A Heegner number is a square-free positive integer d such that the ring of algebraic integers of the rationals adjoined square root negative d has unique factorization. There are nine Heegner numbers: 1, 2, 3, 7, 11, 19, 43, 67, and 163. There are many apparent mathematical coincidences involving Heegner numbers that can be explained by complex multiplication and the q-expansion of the j-invariant. That is a lot of jargon - just enjoy the shirt. Ideal for any situation, a unisex heavy blend crewneck sweatshirt is pure comfort. These garments are made from polyester and cotton. This combination helps designs come out looking fresh and beautiful. The collar is ribbed knit, so it retains its shape even after washing. There are no itchy side seams on these sweaters. .: Made with a medium-heavy fabric blend of 50% cotton and 50% polyester (8.0 oz/yd² (271.25 g/m²)), this sweatshirt feels cozy and is the perfect choice for those colder months..: The classic fit along with the crew neckline