Discrete Mathematics/Combinatory logic< Discrete Mathematics
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Two of the basic principles of combinatory logic in discrete mathematics are the Sum principle and the Multiplication principle.
The sum principle holds true in a given partitioned set X where partition Xi intersected with Xj is the empty set unless i is equal to j. The principle states that in such a partitioned set, the sum of the elements of each partition is equal to the number of elements in the set X.