Origineel bericht: https://mathstodon.xyz/@johncarlosbaez/114338144470097721 https://cdn.nostrcheck.me/23a2cf63ec81e65561acafc655898d2fd0ef190084653fa452413f75e5a3d5bc/dda235ae4f449a7fbd3ef70c5562e8cde6c8df7493b66b24540dec4e1d3d1fbb.webp
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