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The position vector is four dimensional, a quaternion:

p= w +ix + jy + kz = w = v where w=ct is a real number and v is a three dimensional vector v=ix +jy +kz.

The product of positions is a transformation:

p1p2 = (w1 +v1)(w2 +v2)= (w1w2 -v1.v2) + (w1v2 + w2v1 + v1xv2)

The '.' and 'x' are the cosine ans sine of the angles between v1 and v2 thus:

p1p2= (w1 +v1)(w2 +v2)= (w1w2 -v1v2cos(v1v2)) + (w1v2 + w2v1 + v1v2sin(v1v2))

If v1 is perpendicular to v2 then cos(v1v2) is zero and sin(v1v2) is +- 1. if v1 is parallel to v2 then sin(v1v2) is zero and cos(v1v2) is +-1.

Einstein's Relativity "interval" is a contraction of p1p2= ct1ct2 - x1x2 -y1y2 -z1z2.

p1p2 is also |p1p2|( Cos(p1 +p2) + sin(p1 +p2)). This implies that Einstein's "interval" is cos(p1 +p2) and the interval is zero when cos(p1 +p2) is zero or the sum of the angles p1 +p2 is a multiple of 90 degrees.

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