Key points are not available for this paper at this time.
Mutation testing measures the adequacy of a test suite by seeding artificial defects (mutations) into a program. If a mutation is not detected by the test suite, this usually means that the test suite is not adequate. However, it may also be that the mutant keeps the program's semantics unchanged-and thus cannot be detected by any test. Such equivalent mutants have to be eliminated manually, which is tedious.
Schüler et al. (Sun,) studied this question.