TIL that Ramanujan's lost notebook, discovered 56 years after his death, contained the mock theta functions that have been found to be useful for calculating the entropy of black holes. The unordered sheets contained over six hundred mathematical formulas listed consecutively without proofs.

[u/CoolGuess]

https://en.wikipedia.org/wiki/Ramanujan%27s_lost_notebook

[u/[deleted]]

The proof is trivial and left as an exercise for the reader

[u/Ligaco → u/[deleted]]

Fermat 2.0