Consider a World map that includes a Tissot’s Indicatrix, and that and in the image of a Tissot circle below are local longitudinal and latitudinal scale factors, respectively.

Consider a World map that includes a Tissot’s Indicatrix, and that and in the image of a Tissot circle below are local longitudinal and latitudinal scale factors, respectively.

What does it mean if a x b ≠ 1?