Definition:Subset Relation
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Definition
The subset relation, written $\subseteq$, is the class of all ordered pairs $\tuple {x, y}$ such that $x$ is a subset of $y$.
Also known as
The subset relation is referred to as the inclusion relation by some sources.
Also see
- Results about the subset relation can be found here.
Sources
- 2010: Raymond M. Smullyan and Melvin Fitting: Set Theory and the Continuum Problem (revised ed.) ... (previous) ... (next): Chapter $4$: Superinduction, Well Ordering and Choice: Part $\text I$ -- Superinduction and Well Ordering: $\S 1$ Introduction to well ordering