Definition: Two statements, one of which is denied so that the other is enforced. This is also the relationship implicit in contrasting statements.
Conjunctions: not...but, etc.
Distinctions: Alternative, Concessive (Hover over a relationship to see how it differs.)
Alternative (A) vs Negative-Positive (-/+)
Alternative is different from Negative-Positive in that with Alternative, there are two options in the author/speaker's mind. Conversely, Negative-Positive acts like two sides of the same coin.
Also, Alternative is a Coordinate relationship (neither proposition is supporting the other) whereas Negative-Positive is Subordinate, the negative proposition supporting the positive.
Hmm... Should I study for the exam this morning or sleep in? (Alternative)
I did not lie, but told him the whole story. (Negative-Positive)
Negative-Positive (-/+) vs Concessive (Csv)
With Negative-Positive, we find the author/speaker asserting one thing in two ways: with negation and affirmation. With Concessive, we also find the author/speaker asserting a single thing, but in a different manner; the author/speaker makes a concession of a seemingly contrary truth whose acknowledgement turns to strengthen his/her declaration.
Bill does not like black coffee, but really enjoys his cream and sugar. (Negative-Positive)
Bill is a picky eater, but he does like fish. (Concessive)