What is SYMMETRY?

1 A geometric configuration is said to be symmetrical about a point, line or plane if any line through the point or any line perpendicular to the line or plane cuts the configuration in pairs of points equally spaced from the point, line or plane, which are then referred to respectively as the centre of symmetry, the axis of symmetry and the plane of symmetry>. 2 A function of several variables is symmetric if it is unchanged when any two of the variables are interchanged.


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