Download Mathematics for computer graphics applications by Mortenson M.E. PDF

By Mortenson M.E.

Comprises new chapters on symmetry, restrict and continuity, positive good geometry, and the Bezier curve. presents many new figures and workouts. includes an annotated urged studying checklist with workouts and solutions in each one bankruptcy. Appeals to either teachers and pros. deals a brand new recommendations guide for teachers.

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Proof Let k ∈ {1, . . , h} and let G k be a dkth pseudo-approximate root of f . Uniqueness in Lemma 19 allows us to repeat the first part of the proof starting with G k instead of y n/dk . By Proposition 28, int( f, G k ) = int( f, T(G k )). But App( f, dk ) can be obtained by applying the operation T finitely many times to G k . Hence the result is a consequence of Proposition 29 and Corollary 13. Corollary 14 For all k ∈ {1, . . , h}, App( f, dk ) is irreducible. In particular, App( f, dk ) is a dkth pseudo-approximate root of f .

Proposition 22 Under the standing hypothesis. (i) The sequence of Newton–Puiseux exponents of G k is given by m1 , . . , mdk−1 dk k (ii) The r -sequence and d-sequence of G k are given, respectively, by and d0 , . . , ddk−1 ,1 dk k . r0 , . . , rk−1 dk dk . Proof (i) This follows from the expression of Y (t) and the definition of Newton– Puiseux exponents, using the fact that gcd dnk , . . , mdk−1 is one. k (ii) Let R, D, E be the characteristic sequences associated with G k . We have D1 = R0 = deg y G k = dnk = dr0k = ddk1 , R1 = mdk1 = dr1k and D2 = gcd( dr0k , dr1k ) = dd2k .

We proceed as in Lemma 19 to compute App( f ; 2). We start with G = y 6/2 = y 3 . The G-adic expansion of f is G 2 + (−2x 2 )G + (x 4 − x 5 y). Hence α1 = −2x 2 = 0. So, we need to compute G 1 = T(G) = y 3 − x 2 . The G 1 -adic expansion of f is f = G 21 + (−x 5 y), and now α11 = 0. This means that g = G 1 = y 3 − x 2 = App( f ; 2). The picture below is in R2 : the dashed line corresponds to g. 2 Characteristic Sequences 47 y x Thus we have an algorithmic method to calculate approximate roots of f .

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