Lev Pontryagin

No.10217443 ViewReplyOriginalReport
lost his eyesight due to a primus stove explosion when he was 14. Despite going blind, he was able to be one of the best mathematicians of the 20th century. Is it possible for regular people to train their imagination and memory to be able to do mathematics like him all in their head, without needing to write it all down on paper? How does one gain this ability?