"a " G a2 = e G
(G1, ·), (G2, ć%) G1 × G2
(a1, b1) " (a2, b2) = (a1 · a2, b1 ć% b2) G1 G2
G1 •" G2
G Z(G) = {a " G : "g " G ag = ga}
G G
G1 G2
A, B G AB = {ab : a " A, b " B}
H1, H2 < G H1H2 G H1H2 = H2H1
(Z, +)
Zm •" Zn m, n
G H
H
G
G
n = pq n
p n
p p
A4
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