Venture capital is a networks business — from networks of founders to the web of investors and angels and gossamer threads of potential customers, talent and service providers. The density of those networks determines success: Find just the right person to fit a role or a slot on a cap table, and a startup might just get a bit more lift. It’s a topic that Casey Caruso has thought a lot about. In a research project at Stanford, she looked at a slightly different form of network density: using convolution…