Two vectors are collinear if they lie on the same line or on parallel lines:
The definition given above can be written in the formula notation:
where - some constant (scalar).
If we move from vectors notations to the coordinate ones, the formula above takes the form:
( ax, ay, az ) = n ∙ ( bx, by, bz )
therefore, if two vectors are collinear, the following condition is hold:
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