ELI5: Explain Like I'm 5

Quadrature domains

Quadrature domains are like building blocks made out of math. They are shapes made up of math symbols and numbers. People use them to help solve complicated math problems. A quadrature domain has four corners and looks like a square. The corners have math symbols in them that tell us how to solve the math problem. By combining the symbols and numbers, we can figure out what the answer is.