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https://gateoverflow.in/54949/how-many-equivalence-classes-can-be-made-form-1-2-3 https://en.wikipedia.org/wiki/Bell_number

On the wiki page under the section for set partitions it says that for a set {a,b,c} there are 5 set partitions, and in the top link it says that there are 5 equivalence relations, how are these related?

Bernard
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4M4D3U5 M0Z4RT
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    "How are these related?" For every equivalence relation there is a corresponding partition and vice versa. There are exactly as many partitions as there are equivalence relations for a set. – JMoravitz Jan 02 '19 at 23:50
  • Where could I read about this in more detail? – 4M4D3U5 M0Z4RT Jan 03 '19 at 00:07

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