User talk:Ashley J. Ballard: Difference between revisions
imported>Jitse Niesen (→Cardinality: new section) |
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:<math>\mathfrak{a} + \mathfrak{b} = \mathfrak{a \cdot b} = \max (\mathfrak{a},\mathfrak{b}).</math> | :<math>\mathfrak{a} + \mathfrak{b} = \mathfrak{a \cdot b} = \max (\mathfrak{a},\mathfrak{b}).</math> | ||
That does not seem to be true for finite cardinal numbers. Is there perhaps some condition on the cardinal numbers that I overlooked? -- [[User:Jitse Niesen|Jitse Niesen]] 13:14, 28 October 2008 (UTC) | That does not seem to be true for finite cardinal numbers. Is there perhaps some condition on the cardinal numbers that I overlooked? -- [[User:Jitse Niesen|Jitse Niesen]] 13:14, 28 October 2008 (UTC) | ||
:Yes, of course, you're right! That was a bit silly of me. It doesn't work if they are both finite, or if either of them is 0, but otherwise it's true. [[User:Ashley J. Ballard|Ashley J. Ballard]] 04:56, 29 October 2008 (UTC) | |||
Revision as of 22:56, 28 October 2008
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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
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)
- Yes, of course, you're right! That was a bit silly of me. It doesn't work if they are both finite, or if either of them is 0, but otherwise it's true. Ashley J. Ballard 04:56, 29 October 2008 (UTC)