47. express aut(u(25) in the form z,, dz, 48. determine aut(z, z,). 40 sunnase that n n. are nositie even inted

check attachment 48  Z2+Z2=⟨(0,1),(1,0)⟩=⟨(1,0),(1,1)⟩=⟨(1,1),(0,1)⟩and these are only only generators with minimum no. of elements Now f is a automorphism on Z2×Z2 iff  f sends ...