User talk:Ashley J. Ballard

Welcome!

Welcome to the Citizendium! We hope you will contribute boldly and well. Here are pointers for a quick start. You'll probably want to know how to get started as an author. Just look at CZ:Getting Started for other helpful "startup" links, and CZ:Home for the top menu of community pages. Be sure to stay abreast of events via the Citizendium-L (broadcast) mailing list (do join!) and the blog. Please also join the workgroup mailing list(s) that concern your particular interests. You can test out editing in the sandbox if you'd like. If you need help to get going, the forums is one option. That's also where we discuss policy and proposals. You can ask any constable for help, too. Me, for instance! Just put a note on their "talk" page. Again, welcome and have fun! D. Matt Innis 10:59, 14 September 2008 (CDT)

Cardinality

Hi Ashley. I just saw the page on cardinality that you wrote. Very nice work, thank you. Unfortunately, I know nothing about set theory, so all I could do is add some links. However, I do wonder about the formula

${\mathfrak {a}}+{\mathfrak {b}}={\mathfrak {a\cdot b}}=\max({\mathfrak {a}},{\mathfrak {b}}).$

That does not seem to be true for finite cardinal numbers. Is there perhaps some condition on the cardinal numbers that I overlooked? -- Jitse Niesen 13:14, 28 October 2008 (UTC)