Abstract
Two special classes are said to be similar if they determine the same upper radical. A necessary and sufficient condition for a special radical to be generated by distinct similar special classes is given and all similar special classes generating a given special radical are described.
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France-Jackson, H. On Similar Special Classes. Acta Mathematica Hungarica 93, 249–251 (2001). https://doi.org/10.1023/A:1013990929932
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DOI: https://doi.org/10.1023/A:1013990929932