Remark 10. The advantage of ‘nef’ instead of ‘ample’ is that if we blow up the model further, the pullback of the model line bundle will stay nef, but ampleness will be lost.
Remark 10. The advantage of ‘nef’ instead of ‘ample’ is that if we blow up the model further, the pullback of the model line bundle will stay nef, but ampleness will be lost.