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what does positive and negative sequence really mean, for all I know that a-b-c is a positive seq, while a-c-b is a negative seq. Are they just an assumption?
A sinusoidal three-phase system can be represented by three vectors, one for A, B, and C phase. You can do a linear transformation on those three vectors to give three other vectors called positive, negative and zero sequence vectors.
Positive sequence would be 120 degrees apart with A leads B leads C. Negative sequence would be 120 degrees apart all with same magnitude, with A leads C leads B. Zero sequence would be all in phase and the same magnitude.
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