Im looking for the cardinality of a Set where X is an element of the Real Numbers such that lxl = -1..... what's this mean ?!

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- Jan 27th 2009, 03:18 PMnikie1o2Cardinality of a Set
Im looking for the cardinality of a Set where X is an element of the Real Numbers such that lxl = -1..... what's this mean ?!

- Jan 27th 2009, 03:21 PMPlato
HINT: There is no real number such that $\displaystyle |x|=-1$

- Jan 27th 2009, 03:25 PMnikie1o2
- Jan 27th 2009, 03:33 PMPlato
Well, YES.