Before revision: For example, the fact that "student John Smith is not lazy" is a counterexample to the generalization “ students are lazy ” , and both a counterexample to, and disproof of, the universal quantification “ all students are lazy.
After revision: For example, the fact that "student John Smith is not lazy" is a counterexample to the generalization " students are lazy " , and both a counterexample to, and disproof of, the universal quantification " all students are lazy.