I have been separated from her for a year.

This is a different problem.

Please tell me the difference between these two products.

This is my first question.

I was really surprised by his cruelly brusque treatment.

The staff at that restaurant provided astonishingly kind treatment, and we were very satisfied.

Discrete mathematics is an important field that forms the basis of computer science.

He is majoring in applied mathematics at university.

He is passionate about researching pure mathematics.

He is a world-famous mathematician.