Pre-hyperidentities generalize the concept of a hyperidentity. A variety $V$ is said to be pre-solid if every identity in $V$ is a pre-hyperidentity. Every solid variety is pre-solid. We consider pre-solid varieties of semigroups which are not solid, determine the smallest and the largest of them, and some elements in this interval.
@article{107538, author = {K. Denecke and J\"org Koppitz}, title = {Pre-solid varieties of semigroups}, journal = {Archivum Mathematicum}, volume = {031}, year = {1995}, pages = {171-181}, zbl = {0842.20049}, mrnumber = {1368256}, language = {en}, url = {http://dml.mathdoc.fr/item/107538} }
Denecke, K.; Koppitz, Jörg. Pre-solid varieties of semigroups. Archivum Mathematicum, Tome 031 (1995) pp. 171-181. http://gdmltest.u-ga.fr/item/107538/
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