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Quadratic maps in two variables on arbitrary fields. (English) Zbl 1488.15046

Summary: Let \(\mathbb{F}\) be a field of characteristic different from 2 and 3, and let \(V\) be a vector space of dimension 2 over \(\mathbb{F}\). The generic classification of homogeneous quadratic maps \(f : V\to V\) under the action of the linear group of \(V\), is given and efficient computational criteria to recognize equivalence are provided.

MSC:

15A72 Vector and tensor algebra, theory of invariants
11E88 Quadratic spaces; Clifford algebras
12E20 Finite fields (field-theoretic aspects)
12E30 Field arithmetic
13A50 Actions of groups on commutative rings; invariant theory
15A66 Clifford algebras, spinors