I had the experience of trying to relearn some math just a few years after first learning it in college and it was similarly much easier to learn it all a secon

I had the experience of trying to relearn some math just a few years after first learning it in college and it was similarly much easier to learn it all a second time. I don't think I had a whole bunch of new experience. I think rather there must be some kind of residual understanding, even if it can't all be articulated cold.