[effed3]

Giving no credits on a "co-author" is a bit different than plagiarize (a theft). It's reasonable to suppose than both authors can have reach results indipendently, given enough time, working on the same matter, maybe Dedekind before Cantor? Probably Cantor has the core ideas in it's mind, and Deedekind's arguments was similar enough to push him proced. Sure Dedeking has given a (big) contribution, but the core concept is from Cantor