Definition:Cartesian Coordinate System/Also defined as
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Definition
In the definition of a Cartesian coordinate system, some older sources do not specify that the coordinate axes have to be perpendicular.
That is, such sources include oblique coordinate systems in the category of Cartesian coordinate systems
Such sources then refer to a Cartesian coordinate system in which the axes are specifically perpendicular as a rectangular coordinate system.
However, this is non-standard, and the contemporary view is that Cartesian coordinate systems are rectangular by default.