What is the cardinality of the power set {NULL, a, {NULL}, {{NULL}}}? Why? I believe it is 3.

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- September 23rd 2012, 06:15 AMpeyton1983Cardinality of a set
What is the cardinality of the power set {NULL, a, {NULL}, {{NULL}}}? Why? I believe it is 3.

- September 23rd 2012, 08:47 AMPlatoRe: Cardinality of a set
- September 25th 2012, 06:16 AMemakarovRe: Cardinality of a set