set theory

SET THEORY – A set is an unordered collection of unique elements.

Let:

A = {1, 2, 3}

B = {3, 4, 5}

Notation	Operation	Python	Result
A∩B	Intersection	print(A & B)	{ 3 }
A∪B	Union	print(A | B)	{ 1, 2, 3, 4, 5 }
A-B	Difference (or relative complement)	print(A – B)	{ 1, 2 }
B-A	Difference (or relative complement)	print(B – A)	{ 4, 5 }
A∆B	Symmetric difference	print(A ^ B)	{ 1, 2, 4, 5 }

A = {1, 2, 3}
B = {3, 4, 5}

print(A & B)
print(A | B)
print(A - B)
print(B - A)
print(A ^ B)

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