I really like the idea of exponential learning, and was disappointed to see that this is just an ad for spaced repetition. My opinion is that true exponential

I really like the idea of exponential learning, and was disappointed to see that this is just an ad for spaced repetition. My opinion is that true exponential learning depends on specific content in a specific order. What we need is the dependency tree of concepts. Does such a thing exist? Curriculums are kind of a non-rigorous attempt at this.