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Vector tangent to axis?

  1. Nov 14, 2013 #1
    How does it look like if three unit vectors at a point such that each vector is tangent to one of the axes in 3-Dimensional Cartesian System? Can anyone illustrate about this? Thanks.
  2. jcsd
  3. Nov 14, 2013 #2


    User Avatar
    Gold Member

    It looks exactly like the standard drawing of a 3D graph basis, just with the center offset accordingly (unless your point is AT the origin, in which case it is exactly the standard drawing)
  4. Nov 14, 2013 #3

    Does it mean that the vector is parallel to the axis?
  5. Nov 14, 2013 #4


    Staff: Mentor

    Which vector and which axis?

    You mentioned three unit vectors and three axes in your OP.
  6. Nov 14, 2013 #5
    each unit vector parallel to each axes? if I have three unit vector u, v ,w, and axes x , y, z , then u parallel to x , v parallel to y , w parallel to z?
  7. Nov 14, 2013 #6


    Staff: Mentor

    If each one is tangent to an axis, then it is parallel to that axis.
  8. Nov 15, 2013 #7
    I'm reading "An Introduction to Tensors for Students of Physics and Engineering"

    I cannot understand in the triangular coordinate systems, how i and i* now meet at an angle of 60°?
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