-- -*- M2-comint -*- hash: -475303986

i1 : A = skewPolynomialRing(QQ,(-1)_QQ,{w,x,y,z})
--Calling Bergman for NCGB calculation.
Complete!

o1 = A

o1 : NCQuotientRing

i2 : B = QQ[a,b,c,SkewCommutative=>true]

o2 = B

o2 : PolynomialRing, 3 skew commutative variables

i3 : f = ncMap(B,A,{a^3,b^2,a+b,a-b})

o3 = NCRingMap B <--- A

o3 : NCRingMap

i4 : matrix f

o4 = | 0 0 a+b a-b |

             1       4
o4 : Matrix B  <--- B

i5 : g = ncMap(A,A,{x,y,z,w})

o5 = NCRingMap A <--- A

o5 : NCRingMap

i6 : matrix g

o6 = | x y z w |

o6 : NCMatrix

i7 : 
