Work out subset checker instantly with clear inputs, formula shown and shareable results.
A is a subset of B when every element of A also lies in B. It is a proper subset when it is a subset but not equal, which requires B to have at least one extra element.
Subset
A ⊆ B ⇔ every x ∈ A satisfies x ∈ B
Yes, and a proper one since B has three further elements.
Yes, but not a proper subset. Proper subsets must be strictly smaller.