As you all know my readers left, the position of anything can refer to a coordinate axis system associating a vector r = (x, y, z). If we have two of these vectors, r1 R2 and we can always get a third party by a vector product. And the only thing that interests us in this time of the product vector is that its result is a vector perpendicular to the vectors being multiplied. This operation is usually written as follows:
r3 = x r1 r2
Well ... imagine, vacuum readers thought I was rather surprised today when leaving the train station when suddenly I see that the direction of a bus is as follows (the names do not match, but the format itself):
"Sada x Oleiros "
No! You will say. What aberration is that! Might think. But why? Unconscious. If your address is "Sada x Oleiros" is not the driver is an ignorant, quite the opposite. Taking
Sada as the vector that indicates the position of Sada, and ditto Oleiros as Oleiros, it is clear that the driver will take a direction perpendicular to the surface of the earth and no better way of putting it than that. The driver remembers high school math, not that you forgot the spelling!
Now there is to know whether it was a flying bus or TBM. Today
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