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1. How many distinct binary relations can be constructed from a given set A with cardinality 3 to a given set B with cardinality 4?
 one year ago
 one year ago
1. How many distinct binary relations can be constructed from a given set A with cardinality 3 to a given set B with cardinality 4?
 one year ago
 one year ago

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I think I can construct 3 * 4 + 1 distinct binary relations.
 one year ago

NodataBest ResponseYou've already chosen the best response.0
I think I was lost. To know the number of binary relations I can get from to given set with known cardinalities I need to know the cardinality of the power set of the cartesian product. I know that the cardinality of a power set is given by:\[\#P(A) = 2^{\#A}\]
 one year ago

NodataBest ResponseYou've already chosen the best response.0
And I know too that the cardinality of the Cartesian product is equal to the product of the cardinalities of every set involved. So \[\#(A\times B) = \#A\cdot \#B\]
 one year ago

NodataBest ResponseYou've already chosen the best response.0
So \[\#P(A\times B)=2^{\#A\cdot \#B}\]
 one year ago

NodataBest ResponseYou've already chosen the best response.0
So the number of binary relations I cant get is given by: \[ 2^{12} \]
 one year ago
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