In [23] H.Tachikawa gave two theorems: Every maximal quotient QF-3 ring is represented as an endomorphism ring of some kind of module; Every QF-3 ring is a special subring of the maximal quotient QF-3 ring. These theorems are a little sophisticated in [18]. On the other hand, in [3] Y.Baba and K.Iwase defined quasi-Harada rings (abbreviated QH rings) and showed that QH rings are QF-3. So now we have several rings which are also QF-3 rings: Serial rings, one-sided Harada rings, quasi-Harada rings, and (one-sided artinian) QF-2 rings. In this paper we apply the above two theorems for QF-3 rings to these rings. And we study the structure of these rings. [References: 23]
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