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  "path": "/researchers-break-a-150-year-old-math-law-with-a-surprising-donut-discovery/",
  "publishedAt": "2026-04-04T23:20:45.000Z",
  "site": "https://scitechdaily.com",
  "tags": [
    "Science",
    "Mathematics",
    "Technical University of Munich",
    "Topology"
  ],
  "textContent": "A 150-year-old geometry rule has been overturned after mathematicians found two different torus surfaces with identical metric and curvature. For more than 150 years, a principle attributed to French mathematician Pierre Ossian Bonnet has guided surface theory. It states that if the metric and mean curvature of a compact surface are known at every point, [...]",
  "title": "Researchers Break a 150-Year-Old Math Law With a Surprising Donut Discovery"
}