Introduction to Plane Algebraic Curves by Ernst Kunz

By Ernst Kunz

This paintings treats an advent to commutative ring conception and algebraic aircraft curves, requiring of the scholar just a uncomplicated wisdom of algebra, with the entire algebraic evidence accumulated into numerous appendices that may be simply noted, as needed.

Kunz's confirmed perception of training themes in commutative algebra including their functions to algebraic geometry makes this booklet considerably various from others on airplane algebraic curves. The exposition specializes in the in basic terms algebraic points of aircraft curve conception, leaving the topological and analytical viewpoints within the heritage, with purely informal references to those topics and proposals for extra reading.

Most very important to this text:

* Emphasizes and makes use of the idea of filtered algebras, their graduated jewelry and Rees algebras, to infer uncomplicated evidence in regards to the intersection conception of aircraft curves

* provides residue idea within the affine aircraft and its functions to intersection theory

* tools of evidence for the Riemann–Roch theorem comply with the presentation of curve thought, formulated within the language of filtrations and linked graded rings

* Examples, workouts, figures and proposals for extra research around out this rather self-contained textbook

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From a overview of the German edition:

"[T]he reader is invited to profit a few subject matters from commutative ring conception by way of almost always learning their illustrations and purposes in airplane curve thought. This methodical technique is unquestionably very enlightening and effective for either academics and students…The entire textual content is a true masterpiece of readability, rigor, comprehension, methodical ability, algebraic and geometric motivation…highly enlightening, motivating and enjoyable on the similar time…One easily can't do greater in writing this kind of textbook."

--Zentralblatt MATH

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Tm }. 13, however, we have dimK K[X](X) /(f (X, aX)) = ν(f (X, aX)). This shows that (1) holds, and the proof is complete. 4. At a point of multiplicity m > 0 on an algebraic curve there is at least one and there are at most m tangents. 6 Regular and Singular Points of Algebraic Curves. 5. Let F = ti=1 Fini , where the Fi are irreducible curves and ni ∈ N+ for i = 1, . . , t. Then for every point P ∈ P2 (K), t mP (F ) = i=1 ni · mP (Fi ). Proof. We can assume that P = (0, 0) and that the line at infinity is not a component of F .

9(a) it follows that K[f ∩ g] has at most p · q maximal ideals. Hence V(f ) ∩ V(g) contains at most p · q points. 7). In the projective plane not only do two lines always intersect, but also any two curves of positive degree always intersect. The corollary could also be formulated in this way: A system of equations F (X0 , X1 , X2 ) = 0, G(X0 , X1 , X2 ) = 0, with relatively prime homogeneous polynomials F and G of degrees p and q has at least one and at most p · q solutions in P2 (K). 9, that f and g have no points at infinity in common.

8 implies in particular that μP (F, H) > 1 if a multiple component containing P appears in F (or in G). 11. Under the assumptions of B´ezout’s theorem, suppose that V+ (F1 ) ∩ V+ (F2 ) is a set of points at finite distance, and let f1 , f2 be the affine curves corresponding to F1 , F2 . Then the following are equivalent: (a) V+ (F1 ) ∩ V+ (F2 ) consists of ρ := deg F1 · deg F2 distinct points. (b) F1 and F2 are reduced curves and K[f1 ∩ f2 ] is a direct product of ρ copies of the field K: ρ K[f1 ∩ f2 ] = K.

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