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by alejohausner 3574 days ago
One of the commenters to the original article talks about this phenomenon specifically. Each math course you took taught you some ideas or techniques, but those techniques weren't really learned until you used them in the next course. For example, you didn't learn algebra well until you used it in calc 1; calc 1 skills are really cemented in difeq.

https://micromath.wordpress.com/2011/05/17/time-lag-in-learn...