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## Main Question or Discussion Point

Ok im a bit confused here. According to the definition of a proper subset means that everything in set A is in set b and a set always contains an extra pair of brackets. But in this example

C={∅,{∅}} why is this correct ∅ ⊆C instead of {∅} ⊆C for the first object?

C={∅,{∅}} why is this correct ∅ ⊆C instead of {∅} ⊆C for the first object?