Explicit matrix in SL_3(K[x,y,z]) with first row (x,y,z) for any field K of Stufe at most 4, expressed in terms of a,b,c,d satisfying a²+b²+c²+d²=-1.
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Explicitly combing hedgehogs over fields of Stufe 4
Explicit matrix in SL_3(K[x,y,z]) with first row (x,y,z) for any field K of Stufe at most 4, expressed in terms of a,b,c,d satisfying a²+b²+c²+d²=-1.