I am doing a long 'essay' which is essentially an expansion of a graduate level proof but each time I write something like a lemma down and then try to go back to it, I don't seem to be able to understand it. In other words, I don't seem to understand what I wrote down myself. I do seem to understand it at the moment of writing it down. Why? Does this happen to anyone else?(adsbygoogle = window.adsbygoogle || []).push({});

How can it be corrected?

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# Why is this happening?

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