Thank you for visiting cotpi shop. Use the search box above or browse the list below to find what you're looking to buy for yourself or to gift your geeky friends. Here, you'll find clothes, accessories and stationery with mathematical ideas, formulas and puzzles printed on them. If you have any queries about the products, please do not hesitate to email q@cotpi.com.

Euler's Identity Apparel Buy clothes and caps with Euler's identity printed on them.

Euler's Identity Accessories Buy coffee mugs, accessories and stationery with Euler's identity printed on them.