0
votes
1answer
139 views

Direct products in the category Rel

Please describe direct products in the category Rel.
-7
votes
1answer
146 views

Order of products and order of multipliers

I asked this question (and have received an answer) at MathOverflow. Now a little more difficult question: Let $f$ and $g$ are binary relations (on some set $\mho$). The function $f\times^{C} g$ is ...