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Original Text (Annotation: XAW009763 / 1433693)

' Broombridge on the Royal Canal where this happened:- “ 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 and cut it on a stone of this bridge. ” '

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