Quantifier Elimination and Cylindrical Algebraic by Dr. Bob F. Caviness, Dr. Jeremy R. Johnson (auth.), Dr. Bob

By Dr. Bob F. Caviness, Dr. Jeremy R. Johnson (auth.), Dr. Bob F. Caviness, Dr. Jeremy R. Johnson (eds.)

George Collins’ discovery of Cylindrical Algebraic Decomposition (CAD) as a mode for Quantifier removal (QE) for the simple conception of genuine closed fields introduced a massive step forward in automating arithmetic with contemporary very important functions in high-tech components (e.g. robotic motion), additionally stimulating primary study in machine algebra over the last 3 a long time. This quantity is a state of the art choice of vital papers on CAD and QE and at the similar zone of algorithmic features of actual geometry. It includes papers from a symposium held in Linz in 1993, reprints of seminal papers from the world together with Tarski’s landmark paper in addition to a survey outlining the advancements in CAD dependent QE that experience taken position within the final twenty years.

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Extra info for Quantifier Elimination and Cylindrical Algebraic Decomposition

Example text

Originally we first computed the norm, B*, of B and obtained the minimal polynomial, B, of,B as the appropriate irreducible factor of B*. Then we computed "y by the algorithm SIMPLE of (Loos 1982a), computing as a resultant a polynomial C*(x) having "y = a + t(3, t a small positive integer such that C* is squarefree, as a root, and factoring C* to obtain the minimal polynomial C of "y. If the degrees of A and Bare m and n respectively, it may be that B has degree mn, and C then has degree m 2 n although the degree of C is at most mn.

By an atomic formula we shall mean an expression of one of the forms (0: = (3), (0: > (3) where 0: and (3 stand for arbitrary algebraic terms; according to our previous remarks, parentheses will sometimes be omitted. The first kind of expression Tarski 34 is called an equality, and the second an inequality. Thus, for example, the following are atomic formulas: 1=1+1 O+x=x x· (y +x) = 0 [x· (1 + 1)] + (y . y) > 0 x>(y·y)+x. By a sentential connective we shall mean one of the following three symbols: "', /\, V.

In fact, a monograph embodying those results was scheduled to appear in 1939 under the title The completeness of elementary algebm and geometry in the collection Actualites scientifiques et industrielles, Hermann & Cie, Paris. As a result of the war, the publication did not materialize; two existing sets of page proofs are probably the only trace of this venture. Naturally, I did not abandon the hope of seeing the results in print. However, as often happens with authors, the original version ceased to satisfy me.

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