Original post: https://mathstodon.xyz/@johncarlosbaez/114411751888780743 https://cdn.nostrcheck.me/5536951a9ddf5d8b391843b5c66b5916f2578dd0e514d2cf0b10c24b70c2955b/604594572698b328b988ca0beb9714b0d4edb2364e3567c380f48ff9004e14e5.webp
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