Number theory's as good a place to start as any. You'll learn proof techniques and see a lot of notation in contexts that require varying amounts of background

Number theory's as good a place to start as any. You'll learn proof techniques and see a lot of notation in contexts that require varying amounts of background knowledge. It's feasible that an undergrad intro class would be up your alley if you're a software dev. https://ocw.mit.edu/courses/mathematics/18-781-theory-of-numbers-spring-2012/lecture-notes/ https://ocw.mit.edu/courses/mathematics/18-781-theory-of-num...