Original post: https://mathstodon.xyz/@johncarlosbaez/114338144470097721 https://cdn.nostrcheck.me/7df42aa73a08b5d684c578607de2650ea746e1aa22acf6fe74ceafbe86df934e/ac2adf6ce5a5aa8f0b838ee15eb08463bd4dfa4d0bd5328e8c78f06bade59d16.webp
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