INDEX TO VOL. 51 Becker, P.-G., and J.W. Sander, Irrationality and codes Campbell, C.M., Robertson, E.F., RuSkuc, N., and R.M. Thomas, Reidemeister- Schreier type rewriting for semigroups do Rocio, O.G., and L.A.B. San Martin, Discrete semigroups in nilpotent Lie groups Drdpal, A., On the semigroup structure of cyclic left distributive algebras Forkeotes, A.A., Lattices of lower finite breadth Higgins, P.M., Embedding semigroups in semibands of depth two Hindman, N., and D. Strauss, Nearly prime subsemigroups of BN Hotzel, E., Maximality properties of some subsemigroups of Baer-Levi semigroups Howie, J.M., Gordon Bamford Preston Huth, M., Zero dimensional and connected domains ...............00eeeeeee 63 Jing, F., Abundant semigroups with a medical idempotent Jones, P.R., E-free objects and E-locality for completely regular semigroups Junghenn, H.D., SAP compactifications of N-fold and infinite semidirect products .. Konieczy, J., - see Lipscomb, S. Lakser, H., Padmanabhan, R., and B. Wolk, Varieties of operator semigroups representing partitions Lipscomb, S., and J. Konieczy, Classification of S,-normal semigroups Loganathan, M., and A. Tamilarasi, Construction and representation of regular semigroups Maleki, A. Semigroups of quasi-compact operators Padmanabhan, R., - see Lakser, H. Piskarev, S., and S.-Y. Shaw, Pertubation and comparison of cosine operator functions Plappert, P., A sandwich theorem for monotone additive functions Renardy, M. On the stability of differentiability of semigroups Repnitskii, V.B., On the representation of lattices by subsemigroup lattices of bands Robertson, E.F., - see Campbell, C.M. Rosales, J.C., Function minimum associated to a congruence on integral n-tuple Ruess, W.M., Purely imaginary eigenvalues of operator semigroups RuSkuc, N., Matrix semigroups—generators and relations RuSkuc, N., - see Campbell, C.M. San Martin, L.A.B., - see do Rocio, O.G. Sander, J.W., - see Becker, P.-G. Schmid, J., - see Thurnherr, W. Schwarz, S., Powers of subsets in a finite semigroup Shaw, S.-Y., - see Piskarev, S. Silva, P.V., The word problem for nilpotent inverse monoids ................. 285 Song, G., Identities of semigroup rings over semilattices of completely (0-)simple MNES eed 8s Soa cct ah a variec o uelek AUD, ove. esos mages aia ta Sie 295 Strauss, D., - see Hindman, N. Tamilarasi, A., - see Loganathan, M. Thomas, R.M., - see Campbell, C.M. Thurnherr, W., and J. Schmid, Maximal (semi-)lattices of fractions and injective ee CAEN Gd hee e ko he ROR EER ERRORS EERE 105 Wolk, B., - see Lakser, H. Zapatrin, R.R., A representation theorem for CAC lattices .................. 263 Zheng, H., Strong P-congruences on P-regular semigroups .................-. 217 Zhitomirskiy, G.I., One simple result concerning imprimitivity relations of monoids of transformations and its applications ........ce.ce. ce.ce. ce.ce. ee s 97 402