TY  - JOUR
A1  - Koppitz, Jörg
T1  - Separation of O-n from its proper subsemigroups by a single identity
JF  - Semigroup forum
N2  - For each , we construct an identity that fails in the semigroup of all order-preserving maps on the -element chain but holds in each proper subsemigroup of O-n.
KW  - Order-preserving maps
KW  - Identities
Y1  - 2015
U6  - https://doi.org/10.1007/s00233-014-9674-0
SN  - 0037-1912
SN  - 1432-2137
VL  - 91
IS  - 1
SP  - 128
EP  - 138
PB  - Springer
CY  - New York
ER  -