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Steve MacGregor (esperantujo@xxxxxxxxx) wrote:
> As I learned it, in the US, i =D7 j =3D k,
> but in the UK, i =D7 j =3D -k. =
> It goes along with driving on opposite sides of the street.
Let's remember that quaternions were first introduced in
Ireland, where they drive on the left side of the road,
by William Rowan Hamilton in the 19th century, and his
famous carving on the railing of a bridge says
i^2 = j^2 = k^2 = ijk = -1.
So by his usage, ij = k, not -k. And that's the same
convention taught in the USA.
I don't think conventions vary by country or have anything
to do with what side of the road they drive on. -- Mike Hardy
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