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A concavity property of generalized complete elliptic integrals
Integral Transforms and Special Functions ( IF 1 ) Pub Date : 2020-09-09 , DOI: 10.1080/10652469.2020.1815726
Kendall C. Richards 1 , Jordan N. Smith 1
Affiliation  

We prove that, for p(1,) and βR, the function xβlog1xpKp(xp) is strictly concave on (0,1) if and only if βλ(p):=2p(p22p+2)(p1)(2p23p+3), where Kp represents the generalized complete p-elliptic integrals of the first kind defined by Kp(r):=0πp/2dθ(1rpsinppθ)11/p, where πp:=2pB(1/p,11/p), π2=π, and sinp is the generalized sine function, with sin2=sin. This extends the recently obtained corresponding result for the case that p = 2. We then apply this concavity property to obtain the following functional inequality (likewise extending the previously established result for the case that p = 2): For all r(0,1), we have 2βπp+1<βlog(r)Kp(r)+βlog(r)Kp(r)2β+2log(2p)Kp(1/2p), where r=1rpp, p(1,), and βλ(p). Both bounds are sharp. The sign of equality holds if and only if r=1/2p.



中文翻译:

广义完全椭圆积分的凹性

我们证明, p1个β[R, 功能 Xβ-日志1个-XpķpXp 严格凹入 01个 当且仅当 βλp:=2个pp2个-2个p+2个p-1个2个p2个-3p+3 在哪里 ķp表示由定义的第一类广义完全p-椭圆积分ķp[R:=0πp/2个dθ1个-[Rpppθ1个-1个/p 在哪里 πp:=2个p1个/p1个-1个/pπ2个=π, 和 p 是广义正弦函数,具有 2个=对于p  = 2的情况,这扩展了最近获得的对应结果。然后,我们应用此凹度属性来获得以下函数不等式(对于p  = 2的情况,同样扩展先前建立的结果):对于所有[R01个, 我们有 2个βπp+1个<β-日志[Rķp[R+β-日志[Rķp[R2个β+2个日志2个pķp1个/2个p 在哪里 [R=1个-[Rppp1个, 和 βλp。这两个界限都是尖锐的。平等的迹象只有当且仅当[R=1个/2个p

更新日期:2020-09-09
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