On rings of constants of derivations in two variables in positive characteristic
Piotr Jędrzejewicz (2006)
Colloquium Mathematicae
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Let k be a field of chracteristic p > 0. We describe all derivations of the polynomial algebra k[x,y], homogeneous with respect to a given weight vector, in particular all monomial derivations, with the ring of constants of the form , where .