A Catalog of Special Plane Curves by J. Dennis Lawrence

By J. Dennis Lawrence

Forty years after its preliminary e-book, this quantity maintains to rank one of the field's most-cited references. one of many greatest and most interesting on hand collections, the catalog covers normal houses of curves and kinds of derived curves. The curves and the values in their parameters are illustrated via approximately ninety pictures from a CalComp electronic incremental plotter.
Suitable for college students and researchers in geometry and machine technological know-how, the textual content starts through introducing basic houses of curves and kinds of derived curves. next chapters follow those homes to conics and polynomials, cubic and quartic curves, algebraic curves of excessive measure, and transcendental curves. a complete of greater than 60 distinctive curves are featured, each one illustrated with a number of CalComp plots containing curves in as much as 8 varied versions. Indexes offer tables of derived curves, curve names, and a 95-item advisor to extra reading.

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N=1 The foregoing estimates on Int1 and Int2 give µTa,b f,p ∈ CMp . 2, we can estimate the distance of a Bloch function to the Qp space. 1. 3. For p ∈ (0, 2) and f ∈ B let distB (f, Qp ) = inf{ f − g Qp }. Then distB (f, Qp ) ≈ inf > 0 : 1Ω (f ) (z)(1 B : g∈ − |z|2 )p−2 dm(z) ∈ CMp , where Ω (f ) = {z ∈ D : (1 − |z|2)|f (z)| ≥ } and 1E stands for the characteristic function of a set E. Proof. Because of f ∈ B, this function has the following integral representation: f (z) = f (0) + 1 π D (1 − |w|2 )f (w) dm(w) = f1 (z) + f2 (z), w(1 ¯ − wz) ¯ 2 where f1 (z) = f (0) + 1 π Ω (f ) and 1 π f2 (z) = D\Ω (f ) Note that |f1 (z)| ≤ f B D (1 − |w|2 )f (w) dm(w) w(1 ¯ − wz) ¯ 2 (1 − |w|2 )f (w) dm(w).

If q ∈ [0, p + 2), then D |F (z)|p dm(z) ≈ D |F (z)|p−q |F (z)|q (1 − |z|2 )q dm(z). Proof. For any F ∈ Ap,0 , let I(F ; p, q) = D |F (z)|p−q |F (z)|q (1 − |z|2 )q dm(z). First of all, we recall two basic facts for f ∈ H, fr (z) = f (rz), r ∈ (0, 1) and p ∈ (0, ∞). The first one is the Hardy–Stein identity which reads as: fr p Hp = 2π|f (0)|p + p2 D |fr (z)|p−2 |fr (z)|2 (− log |z|)dm(z). The second one is the following Littlewood–Paley inequalities: fr p Hp |f (0)|p + I(fr ; p, p), p ∈ (0, 2] and |f (0)|p + I(fr ; p, p) fr p Hp , p ∈ [2, ∞).

Since F ∈ Hp , this function can be written as F = BG where G has no zeros with G Hp = F Hp and B is a Blaschke product. Accordingly, |F |p−q |F |q ≤ 2q−1 (|G|p |B|p−q |B |q + |B|p |G|p−q |G |q ). p Since G = 0, letting h = G q yields h ∈ Hq , |h |q = pq −1 |G|p−q |G |q and |B(z)|p |G(z)|p−q |G (z)|q (1 − |z|2 )q−1 dm(z) D |h (z)|q (1 − |z|2 )q−1 dm(z) D q Hq h ≈ F p Hp . For the other estimate we use the Carleson embedding for Hp — see [Ga, pp. 238-239] to get D |G(z)|p |B(z)|p−q |B (z)|q (1 − |z|2 )q−1 dm(z) sup C(a) G a∈D where C(a) = D p Hp , 1 − |a|2 |B(z)|p−q |B (z)|q (1 − |z|2 )q−1 dm(z).

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