Ancestors (7)
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- Cardinal preservation by chain-condition forcing
- Club set
- Essential disjointness of small subfamilies
- Eventual domination on a regular cardinal
- Finite Lévy collapse to omega-one
- Full second-order replacement rank obstruction
- Gimel function
- Kappa-filtration
- Long chain under eventual domination
- Past exam of the mathematics course of the University of Cambridge / 2002 / iii / Paper 21 / 4 / Solution
- Past exam of the mathematics course of the University of Cambridge / 2002 / iii / Paper 21 / 5 / Solution
- Past exam of the mathematics course of the University of Cambridge / 2003 / iii / Paper 19 / 2 / Solution
- Past exam of the mathematics course of the University of Cambridge / 2003 / iii / Paper 19 / 4 / Solution
- Past exam of the mathematics course of the University of Cambridge / 2004 / iii / Paper 24 / 2 / Solution
- Past exam of the mathematics course of the University of Cambridge / 2006 / iii / Paper 25 / 7 / Solution
- Past exam of the mathematics course of the University of Cambridge / 2010 / iii / Paper 20 / 7 / Solution
- Past exam of the mathematics course of the University of Cambridge / 2013 / iii / Paper 19 / 2 / ii / Solution
- Past exam of the mathematics course of the University of Cambridge / 2013 / iii / Paper 19 / 2 / iv / a / Solution
- Past exam of the mathematics course of the University of Cambridge / 2016 / iii / Paper 121 / 1 / c / Solution
- Past exam of the mathematics course of the University of Cambridge / 2016 / iii / Paper 121 / 3 / c / Solution
- Past exam of the mathematics course of the University of Cambridge / 2016 / iii / Paper 121 / 3 / d / Solution
- Past exam of the mathematics course of the University of Cambridge / 2016 / iii / Paper 121 / 4 / c / ii / Solution
- Past exam of the mathematics course of the University of Cambridge / 2017 / iii / Paper 121 / 1 / vi / Solution
- Past exam of the mathematics course of the University of Cambridge / 2018 / iii / Paper 121 / 1 / iii / Solution
- Past exam of the mathematics course of the University of Cambridge / 2019 / iii / Paper 121 / 1 / i / f / Solution
- Past exam of the mathematics course of the University of Cambridge / 2019 / iii / Paper 121 / 3 / ii / Solution
- Past exam of the mathematics course of the University of Cambridge / 2019 / iii / Paper 121 / 3 / v / b / Solution
- Past exam of the mathematics course of the University of Cambridge / 2022 / iii / Paper 116 / 1 / a / Solution
- Past exam of the mathematics course of the University of Cambridge / 2023 / iii / Paper 116 / 1 / a / Solution
- Past exam of the mathematics course of the University of Cambridge / 2024 / iii / Paper 116 / 1 / a / i / Solution
- Past exam of the mathematics course of the University of Cambridge / 2024 / iii / Paper 128 / 2 / a / ii / Solution
- Reflection theorem for definable hierarchies
- Regular cardinalhood is Pi-one definable
- Saturated elementary extension theorem
- Singular cardinal
- Stationary partition by cofinal-sequence fibers
- Strong-inaccessibility absoluteness from rank agreement
- Uniformly narrow regular-height tree branch theorem
- Weakly inaccessible cardinal
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In set theory, a cardinal number is called a **regular cardinal** if it cannot be expressed as the sum of fewer than that many smaller cardinals.