Topological semigroup

In mathematics, a topological semigroup is a semigroup that is simultaneously a topological space, and whose semigroup operation is continuous. Every topological group is a topological semigroup.

See also

• Analytic semigroup
• Compact group – Topological group with compact topology
• Complete field
• Ellis–Numakura lemma – A compact topological semigroup with a semicontinuous product has an idempotent element
• Locally compact group
• Locally compact quantum group
• Ordered topological vector space
• Topological abelian group
• Topological group – Group that is a topological space with continuous group action
• Topological module
• Topological ring
• Topological vector lattice
• Topological vector space – Vector space with a notion of nearness