Download Analytic Inequalities and Their Applications in PDEs by Yuming Qin PDF

By Yuming Qin

This ebook provides a couple of analytic inequalities and their functions in partial differential equations. those comprise critical inequalities, differential inequalities and distinction inequalities, which play a very important position in setting up (uniform) bounds, worldwide life, large-time habit, decay premiums and blow-up of recommendations to varied sessions of evolutionary differential equations. Summarizing effects from an enormous variety of literature resources akin to released papers, preprints and books, it categorizes inequalities when it comes to their varied properties.

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M. 151) 0 t t1 + · · · + e2t ηm 0 0 tm−1 ··· 0 2 Fm (s)e−2s ω 2 (u(s))ds · · · dt1 50 Chapter 1. 152) 0 t t1 + · · · + ηm 0 where tm−1 ··· 0 Fm (s)R(s)ω(u(s))ds · · · dt1 , 0 v(t) = (e−t u(t))2 . 150) and α(t) = (m + 1)a2 (t), hi (t) = c2i ηi (m + 1)Fi2 (t)R(t). 155) V1 (t) − h2 (t)ω(v(t)) = V2 (t), . . 157) Vm−1 (t) = hm (t)ω(v(t)) ≤ hm (t)ω(v(t)). 158) ˇ [606]. 18. ([606]) If H(t) is a C 1 -function on [0, T ), H(t) ≥ 0 for all t ∈ [0, T ), and H(0) = 0, then for all t ∈ [0, T ), t 0 H(t) H (s) ds ≥ .

102) 0 which yields v q (t) ≤ 2q−1 cq (t) exp t 4q q q K L 2 F 2q (s)eqs ds . 95). Now let us prove assertion (2). 104) 0 where r is as in the theorem. , Γ(κq(γ − 1) + 1) ∈ R. 105) 0 where v(t) = (e−t u(t))rq and P is defined as in the theorem. 96). 11 below, whose proof needs the following lemma, due to Bae and Jin [57]. 42 Chapter 1. 13 ([57]). Let a < 1, b > 0, d < 1. If b + d < 1, then for all t > 0, t (t − s)−a (s + 1)−b s−d ds ≤ Ct1−a−d (1 + t)−b . 107) 0 If b + d = 1, then for all t > 0, t (t − s)−a (s + 1)−b s−d ds ≤ Ct−a ln(1 + t).

15) gives that for all t ∈ (0, b], v(t) = 0. 18), we complete the proof. , Henry [355], p. 190); the proof is left to the reader. 3 (The Henry Inequality [355]). 20) m=0 where C0 = 1, Cm+1 = Cm = Γ(mν + δ)/Γ(mν + δ + β). 2 (The Henry Inequality [355]). 3, let a(t) be a non-decreasing function on [0, T ). 21) +∞ zk k=0 Γ(kβ+1) . , Amann [40]), we need to introduce first some basic concepts. By a vector space, we always understand a vector space over K, where K = R or K = C. If M is a subset of a vector space, we set M˙ := M \{0}.

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