What is the cardinality of the set of all people who shall expel us from the paradise that Cantor has created?
October 12, 2012 12:43 PM Subscribe
Sweet descriptions of the empty set?
In one of the mathematics classes I teach, we have been discussing cardinality (of both infinite and finite sets). So, on the assessment I'm giving them next week, there are some questions just asking "what is the cardinality of [this set]," for various values of [this set].
I want to have all sorts of sets there, including the empty set. But I don't just want to ask them what the cardinality of the empty set is. I'm thinking of "the set of all U.S. presidents born in Mexico" or "the set of months with 40 days" or something.
Do you have any entertaining suggestions for a description I could use?