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  • 1 Athens University Department of Mathematics Panepistemiopolis 157 81 Athens Greece Panepistemiopolis 157 81 Athens Greece
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Abstract  

The elements of minimal left (right) ideals in a semi-prime modular annihilator algebraA completely characterized by the property of being singles not in radA. An elements ofA is calledsingle if wheneverasb=0 for somea,b inA then at least one ofas,sb is zero.