3 ms·

I don't think coordinate systems are required to be independent or orthogonal. https://en.wikipedia.org/wiki/Coordinate_system https://en.wikipedia.org/wiki/Co

• SeanLuke 3y ago
  Actually, I think all the examples you provided were independent dimensions. I'll concede orthogonality. More specifically: can you think of coordinate systems with explicit binary or ternary constraints on the parameters in the coordinates? I can't immediately think of any. Holonomic constraints etc. are constraints on the validity of regions of the space, not constraints on the ability of coordinates to exist.
  • itishappy 3y ago
    Good point! Hmm... If I understand correctly, homogeneous coordinates have additional independent dimensions, but are many-to-one instead of constraining their parameters. Maybe normalized homogeneous coordinates? That's not a particularly interesting system. I'm now second guessing my definition of coordinate system...
    • SeanLuke 3y ago
      Would points in a simplex qualify as a coordinate system? Their dimensions would have to sum to 1. That is, so-called "normalized" barycentric coordinates maybe, as opposed to standard barycentric coordinates? https://en.wikipedia.org/wiki/Simplex https://en.wikipedia.org/wiki/Simplex https://en.wikipedia.org/wiki/Barycentric_coordinate_system https://en.wikipedia.org/wiki/Barycentric_coordinate_system