(a) а aH (b) aH = H if and only if a e H (c) aH = bH or aHn bH = ø (d) aH = bH if and only if a ' b e H %3D (e) |aH| = |bH| = |H| %3D (f) aH = Ha if and only if H = a 1 Ha (a) aH is a subgroun of G if and only if a e H

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