Changes

Set theory a branch of mathematics dealing with collections of objects.  It was developed in the late 1800s, primarly by the German mathematician [[Georg Cantor]].  This initial attempt became known as "naive set theory" because mathematicians found flaws in it.  It was replaced by "axiomatic set theory" in the early 1900s.

Set theory a branch of mathematics dealing with collections of objects.  It was developed in the late 1800s, primarly by the German mathematician [[Georg Cantor]].  This initial attempt became known as "naive set theory" because mathematicians found flaws in it.  It was replaced by "axiomatic set theory" in the early 1900s.