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Definition. A set is an unordered collection of distinct objects. The objects in a set are called the elements, or members, of the set. A set is said to contain its elements. A set can be defined by simply listing its members inside curly braces. For example, the set {2,4,17,23} is the same as the set {17,4,23,2}. To denote membership we x ∈ A − B ⟺ x ∈ A AND x ∉ B On the premise A ⊆ B, x ∈ A ⟹ x ∈ B (note the converse need not always hold on this one!) In the case of part (b) in particular, you will show x ∈ B c ⟹ x ∈ A c and the reverse, but on the premise A ⊆ B. That means you can take this latter fact as a given and a tool to use in your proof. Learn everything an expat should know about managing finances in Germany, including bank accounts, paying taxes, getting insurance and investing. Every type of political power presupposes some particular form of human slavery, for the maintenance of which it is called into being. Just as outwardly, that is, in relation to other states the state has to create certain artificial antagonisms in order to justify its existence, so also internally the cleavage of society into castes, ranks and classes is an essential condition of its continuance.