# Difference in definitions of “Minkowski difference”

I'm trying to understand Minkwoski difference, as it relates to collision detection.

It seems, to me, that there are two definitions of Minkowski difference floating around. One, as defined by wikipedia and the other as defined for example here. My question is, am I wrong? Are those two definitions equivalent?

My intuition says no, because according to the Wikipedia definition, if B contains the origin then B+c contains c, and that means that every such c must be contained in A. However, according to the other definition, A-B might contain points not in A.