Look at the definition of a partition of a set. Informally speaking, when you slice a pizza (a set A) into pieces (subse

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Look At The Definition Of A Partition Of A Set Informally Speaking When You Slice A Pizza A Set A Into Pieces Subse 1 (68.15 KiB) Viewed 31 times

Look at the definition of a partition of a set. Informally speaking, when you slice a pizza (a set A) into pieces (subsets of A), you partition it: no pieces overlap (they are pairwise disjoint) but taken together they are the whole pizza (their union is A). If we apply the definition to the set A = {a,b,c}, then we find it has five different partitions: P₁ = {{a}, {b}, {c}}, P₂ = {{a,b}, {c}}, P3 = {{a,c}, {b}}, P4 = {{a}, {b,c}}, P5 = {{a,b,c}}. How many partitions are there of the set A = {a,b,c,d}? [1P]