Many textbooks define the notion of relation using the notion of n-tuple. So here is my point:
How can you define relation
using n-tuple if an n-tuple itself should be defined
using the notion of ordering (i.e a relation.) ?
closed as off topic by Emil Jeřábek, Deane Yang, Chandan Singh Dalawat, Tom Leinster, Joel David Hamkins Jan 6 2012 at 12:42