Title is misleading. This isn't learning exponentially. Anybody who has used a spaced repetition app (like Anki) knows that you generally learn around the same number of words every day. You're not going to be learning 10 words in a day and then one week later, learn 1000 words in a day.
This article talks about how the reps needed to learn one piece of information, reduces exponentially over time. You might need 1 rep per day at the beginning, but only 1 rep per 100 days after a month. This basically means that if you have a lifespan of 100 years, spaced repetition means you only need around 10-20 reps to remember each piece of knowledge for the rest of your life.
But learning N items will still take 10*N reps. It scales linearly. A far cry from exponential
This article talks about how the reps needed to learn one piece of information, reduces exponentially over time. You might need 1 rep per day at the beginning, but only 1 rep per 100 days after a month. This basically means that if you have a lifespan of 100 years, spaced repetition means you only need around 10-20 reps to remember each piece of knowledge for the rest of your life.
But learning N items will still take 10*N reps. It scales linearly. A far cry from exponential