And Algebra ? Cause there are few subjects that help you quite so much to think in the abstract and when it becomes automatic, you see yourself toying with conc

And Algebra ? Cause there are few subjects that help you quite so much to think in the abstract and when it becomes automatic, you see yourself toying with concept from any level without needing to define everything below to anchor them in reality. My non-maths wife is so much more attached to these anchors it s hard for her sometimes to accept to discuss ideas from a high level by accepting for now not to explain how their parts came to be. Calculus I imagine is useful to calculate an interest rate at the bank to avoid maybe stupid surprises ? But I wonder if advanced calculus is necessary indeed.