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quasar987

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If not, write the definition of orientation. you're using.

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If not, write the definition of orientation. you're using.

If you refer to the attached file, this matix has a positive orientation (and the sign of the determinant is positive) since the direction from (a,b) to (c,d) is counterclockwise, which is the same orientation as R2 (counterclockwise). Thanks!

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quasar987

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Your little drawing with arrows does not constitute a mathematical definition.

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