semilattice semigroup 4 05C25 2 20M15 2 20M20 2 22A05 2 22A15 2 22A26; 20M18 2 \(H\)-closed 2 absolutely \(H\)-closed 2 closure 2 inverse semigroup 2 inverse subsemigroup 2 order-preserving transformation 2 orientation-preserving transformation 2 orientation-reversing transformation 2 quasitopological group 2 semitopological semigroup 2 strong inverse 2 topological Brandt \(\lambda^0\)-extension 2 topological group 2 transformation 2 06A12 1 06B10,11A99 1 20M10 1 band 1 co-maximal 1 commutative semigroup 1 convolution 1 cover 1