‘Well, regular math, or applied math, is what I suppose you could call practical math,’ he said. ‘It’s used to solve problems, to provide solutions, whether it’s in the realm of economics, or engineering, or accounting, or what have you. But pure math doesn’t exist to provide immediate, or necessarily obvious, practical applications. It’s purely an expression of form, if you will – the only thing it proves is the almost infinite elasticity of mathematics itself, within the accepted set of assumptions by which we define it, of course.’

—
Hanya Yanagihara,

*A Little Life*