Cartesian coordinate system

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a coordinate system for which the coordinates of a point are its distances from a set perpendicular lines that intersect at the origin of the system

References in periodicals archive ?
is irrelevant, leaving only the first quadrant in Fig.
Skewness of rotated coordinates cannot be avoided in Minkowski's diagrams because relative rotation of coordinates must be restricted to the first quadrant in Scheme I (or in the one-world picture), as deduced earlier.
Now corresponding to the unprimed frame ([MATHEMATICAL EXPRESSION NOT REPRODUCIBLE IN ASCII]) of the 4-observer (Peter, Peter) prescribed on the flat four-dimensional metric spacetime ([SIGMA], ct) earlier, is the unprimed intrinsic frame ([MATHEMATICAL EXPRESSION NOT REPRODUCIBLE IN ASCII]) of intrinsic 2-observer ([phi]Peter, [phi]Peter) in the two-dimensional metric intrinsic spacetime ([phi][rho], [phi]c[phi]t) underlying ([SIGMA], ct) in the first quadrant in Fig.
The fact that the intrinsic angle [phi][psi] can have values in the range [0, [pi]/2) in the first quadrant in Figs.
Likewise the extended mutually orthogonal straight line affine coordinates [MATHEMATICAL EXPRESSION NOT REPRODUCIBLE IN ASCII] constitute a flat affine 3-space, shown as a straight line and denoted by [MATHEMATICAL EXPRESSION NOT REPRODUCIBLE IN ASCII] along the horizontal in the first quadrant.