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A rounded bracket opening right, stating that one set is contained in another.
Also known as: Contained in, Rounded less than
⊂ states that every member of the left set is also a member of the right. Whether it permits the two sets to be equal is not settled: some authors use it for proper subsets only, others allow equality, and careful writing uses ⊆ to remove the doubt.
Is encoded as U+2282 SUBSET OF in the Mathematical Operators block.
Contexts: Mathematics
States that every member of the set on its left is also a member of the set on its right.
Contexts: Mathematics
Carries no settled convention on whether the two sets may be equal: some authors reserve it for proper subsets and others allow equality, so ⊆ and ⊊ are used where the distinction matters.
Contexts: Mathematics
A single curved stroke opening to the right, shaped like a capital C with its ends drawn out horizontally rather than turned in.
Both open rightwards; the subset sign is rounded and the inequality is a sharp wedge.
Containment and combination, the two basic set relations.