My comment contrasted parent and GP. > > Custom work requires much more knowledge. > Anyone can learn.[...] like software engineering. Math is hard. BTW

My comment contrasted parent and GP. > > Custom work requires much more knowledge. > Anyone can learn.[...] like software engineering. Math is hard. BTW I tried the recurse method for about a year, but it became impossible to find some prerequisites - I think because certain basics are assumed, and not always explicitly taught at any stage. A kind of oral tradition. So I'm now refreshing (and sometimes learning) high school algebra/pre-calculus at Khan Academy (and Math SE). Though that mightn't apply to someone with solid high school maths already. My high schooling was interrupted, also maybe I'm a bit stupid, and also need deeper explanation to get it.