José Carlos Cifuentes

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The canonical structures of the plane are those that result, up to isomorphism, from the rings that have the form R[x]/(ax 2 + bx + c) with a = 0.That ring is isomorphic to R[θ], where θ is the equivalence class of x, which satisfies θ 2 = " − c a " + θ " − b a «. On the other hand, it is known that, up to isomorphism, there are only three canonical(More)
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