A Note on the Equation Ph = J H
نویسنده
چکیده
This note shows that PH = H = J H = J m H holds for any non-trivial extension closed pseudovariety of groups. It is known that BH 6 = J m H if H 6 = G. Hence, we generalize as much as possible of the equation PG = BG.
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تاریخ انتشار 1999