The conclusion of an inductive argument has content that goes beyond the content of its premises. If the premises are true, the conclusion must be true. Valid deduction is necessarily truth preserving . A correct inductive argument may have true premises and a false conclusion. Induction is not necessarily truth preserving .
Deduction is erosion-proof.
New premises may completely undermine a strong inductive argument. Induction is not erosion-proof . An argument is totally valid, or it is invalid. Inductive arguments come in different degrees of strengt h. In some inductions the premises support the conclusions more strongly than in others.