（又称“正极限”)- regular aleph
- regular algebra
- regular algebraic equation
- regular algebraic surface
- regular analytic curve
- regular analytic differential
- regular analytic function
- regular analytic set
- regular angle
- regular antiprism
- regular anti-representation
- regular arc
- regular arrow
- regular astroid
- regular A-system
- regular automorphism
- regular Banach space
- regular base
- regular basis
- regular block design
- regular Borel measure
- regular boundary
- regular boundary point
- regular branch
- regular canonical system