The empty set has no elements.
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- Binomial coefficient
- Cartesian equation of a plane
- Classification of a real complex-circle equation
- Closed set
- Cofinite topology
- Compact space
- Compact subset of a Hausdorff space
- Conic type discriminant
- Connected space
- Connected subset
- Connected subset of the real line
- Connected subsets of a cofinite space
- Continuous image of a compact space
- Convex set
- Coprime integers
- Counting measure
- Critical value
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- Disjoint sets
- Edge path
- Empty and open feasible regions
- Empty order
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- Equation
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- Factorial
- Fiber of a function
- Finite subcover
- Finite union
- Free group action
- Graphic matroid
- Hausdorff property of a nonempty product
- Heine-Borel theorem
- Hereditary nonmatroid greedy obstruction
- Image of a function
- Independence system
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- Injection-chain proof of the Cantor-Schröder-Bernstein theorem
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- Power set
- Prime support of an integer
- Proper filter
- Quotient topology
- Set
- Set intersection
- Set partition
- Set union
- Sigma-algebra
- Solution set
- Submodularity of matroid rank
- Transitive group action
- Trivial kernel
- Urelement
- Vector space bases from Zorn's lemma
- Weighted three-vector matroid
- Zermelo set theory
- Zorn's lemma
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