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William Rowan Hamilton Plaque

Memorial
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Here as he walked by on the 16th of October 1843 Sir William Rowan Hamilton in a flash of genius discovered the fundamental formula for quaternion multiplication i² = j² = k² = ijk = −1 & cut it on a stone of this bridge.

From OpenStreetMap (© OpenStreetMap contributors) n448606595

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Photo credits
  • National Inventory of Architectural Heritage
  • Gareth James, Wikimedia Commons · CC BY-SA 2.0
  • Dr Neil Clifton, Wikimedia Commons · CC BY-SA 2.0
  • JP, Geograph · Creative Commons Attribution-ShareAlike 2.0
  • William Murphy from Dublin, Ireland, Wikimedia Commons · CC BY-SA 2.0
  • Maker not stated on source page, www.pinterest.com
  • Maker not stated on source page, www.irishstar.com
  • Maker not stated on source page, tr.pinterest.com
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