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Color photo of a gray, cement plaque mounted in the side of a stone bridge in Dublin. The plaque reads: "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”

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Color photo of a gray, cement plaque mounted in the side of a stone bridge in Dublin. The plaque reads: "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”
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Robert McNees (mcnees@mastodon.social)'s status on Monday, 16-Oct-2023 14:27:17 UTC Robert McNees

Crossing Brougham Bridge in Dublin #OTD in 1843, William Hamilton had a flash of insight. He finally understood how to multiply quaternions after puzzling over the problem for years. He scratched the result into the stone:
i² = j² = k² = ijk = -1
Image: Wikimedia

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