The Story of Euclid by W.b. Frankland

By W.b. Frankland

The publication has no illustrations or index. it can have various typos or lacking textual content. even though, buyers can obtain a unfastened scanned reproduction of the unique infrequent ebook from the publisher's web site ( you may as well preview excerpts of the e-book there. dealers also are entitled to a loose trial club within the normal Books membership the place they could make a choice from greater than one million books for free of charge. unique writer: London, G. Newnes, restricted; book date: 1902; matters: Geometry; Euclid's parts; Euclid's parts; arithmetic / Geometry / common; arithmetic / background

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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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