Original post: https://mathstodon.xyz/@johncarlosbaez/114417962524325440 https://cdn.nostrcheck.me/5536951a9ddf5d8b391843b5c66b5916f2578dd0e514d2cf0b10c24b70c2955b/baeaaaed1b45bc5cb2ea834cbd17bf28a80c569bd38e8da9137ba29245c5664e.webp
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