-- -*- M2-comint -*- hash: 13254910661699167658

i1 : A = QQ{x,y,z}

o1 = A

o1 : NCPolynomialRing

i2 : M = ncMatrix {{x, y, z}}

o2 = | x y z |

o2 : NCMatrix

i3 : sigma = ncMap(A,A,{y,z,x})

o3 = NCRingMap A <--- A

o3 : NCRingMap

i4 : N = ncMatrix {{M},{sigma M}, {sigma sigma M}}

o4 = | x y z |
     | y z x |
     | z x y |

o4 : NCMatrix

i5 : N' = ncMatrix {{sigma sigma M}, {sigma M}, {M}}

o5 = | z x y |
     | y z x |
     | x y z |

o5 : NCMatrix

i6 : N + N'

o6 = | z+x y+x z+y |
     | 2*y 2*z 2*x |
     | z+x y+x z+y |

o6 : NCMatrix

i7 : 
