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Re:Ramanujan's Easiest Formula by qart on Wednesday November 18, 2020 @05:45AM (#25135300)
Not a blackboard, but just a slate. Paper was too expensive for him, so he used it only to write down results.

Source: https://www.quantamagazine.org/three-puzzles-inspired-by-ram...

Re:Ramanujan's Easiest Formula by cpach on Wednesday November 18, 2020 @06:31AM (#25135625)
That’s very fascinating. I guess it still is the case for many people in the world, that paper is too expensive. Whereas for many of us it’s readily available in massive, one might even say infinite, quantities.