Conversation so far:
What is one-to-one correspondence?
He then began looking for a 1-to-1 correspondence between the points of the unit square and the points of a unit line segment.
What year was he doing his work on this?
In 1878, Cantor submitted another paper to Crelle's Journal, in which he defined precisely the concept of a 1-to-1 correspondence.
What is Crelle's Journal?
CANNOTANSWER.
How was his paper accepted?
This paper displeased Kronecker, and Cantor wanted to withdraw it.
Why did it displease Kronecker?
CANNOTANSWER.

Question: Did he work with any other collegues during this time?
Self-contained rewrite: Did Georg Cantor work with any other collegues in addition to Kronecker?