00406    a2200169   4500082001700000100001800017100001900035100002200054245003000076260003300106300001500139504001400154650002300168650001600191650001700207653001200224  a512.86bL98e  aLyapin, E. S.  aLesokhin, M.M.  aAizenshtat, A.Ya.  aExercises in group theory  aNew YorkbPlenum Pressc1972  axiii,240p.  aP.233-235  aTopological groups  aSets theory  aGroup theory  aAlgebra