i1 : A = skewPolynomialRing(QQ,(-1)_QQ,{w,x,y,z})
--Calling Bergman for NCGB calculation.
Complete!
o1 = A
o1 : NCQuotientRing
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i2 : B = QQ{w,x,y,z}/ncIdeal{w*x+x*w,w*y+y*w,x*y+y*x}
--Calling Bergman for NCGB calculation.
Complete!
o2 = B
o2 : NCQuotientRing
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i3 : f = ncMap(B,A,gens B)
o3 = NCRingMap B <--- A
o3 : NCRingMap
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i4 : isWellDefined f
o4 = false
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i5 : C = QQ{a,b,c}
o5 = C
o5 : NCPolynomialRing
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i6 : g = ncMap(C,A,{a^3,b^2,a+b,a-b})
o6 = NCRingMap C <--- A
o6 : NCRingMap
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i7 : isWellDefined g
o7 = false
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