A General and Sharpened form of Opial's Inequality

1974 ◽  
Vol 17 (3) ◽  
pp. 385-389 ◽  
Author(s):  
D. T. Shum
Keyword(s):  
Differentiable Function ◽  
Opial’S Inequality ◽  
Image Position ◽  
Opial's Inequality ◽  
Sharpened Form

Z. Opial [11] proved in 1960 the following theorem:Theorem 1. If u is a continuously differentiable function on [0, b], and if u(0)= u(b)=0 and u(x) > 0 for x ∊ (0, b), then1where the constant b/4 is the best possible.

A Discrete Analogue of Opial's Inequality

1967 ◽  
Vol 10 (1) ◽  
pp. 115-118 ◽  
Author(s):  
James S. W. Wong
Keyword(s):  
Discrete Analogue ◽  
Absolutely Continuous ◽  
Opial’S Inequality ◽  
Image Position ◽  
Opial's Inequality

In a number of papers [1] - [7], successively simpler proofs were given for the following inequality of Opial [1], in case p=1.Theorem 1. If x(t) is absolutely continuous with x(0)=0, then for any p ≧ 0,(1)Equality holds only if x(t) = Kt for some constant K.

scholarly journals Weighted Opial inequalities

2002 ◽  
Vol 33 (1) ◽  
pp. 83-92
Author(s):  
J. J. Koliha ◽  
J. Pecaric
Keyword(s):  
Difference Equations ◽  
Fractional Derivatives ◽  
Kluwer Acad ◽  
General Inequality ◽  
Opial’S Inequality ◽  
Opial's Inequality

This paper presents a class of very general weighted Opial type inequalities. The notivation comes from the monograph of Agarwal and Pang (Opial Inequalities with Applications in Differential and Difference Equations, Kluwer Acad., Dordrecht 1995) and the work of Anastassiou and Pecaric (J. Math. Anal. Appl. 239 (1999), 402-418).  Assuming only a very general inequality, we extend the latter paper in several directions.  A new result generalizing the original Opial's inequality is obtained, and applications to fractional derivatives are given.

scholarly journals The convolution x-r*xs

1976 ◽  
Vol 17 (1) ◽  
pp. 53-56 ◽  
Author(s):  
B. Fisher
Keyword(s):  
Differentiable Function ◽  
Convolution Of Distributions ◽  
Definition Of ◽  
Image Position ◽  
Infinitely Differentiable Function

In a recent paper [1], Jones extended the definition of the convolution of distributions so that further convolutions could be defined. The convolution w1*w2 of two distributions w1 and w2 was defined as the limit ofithe sequence {wln*w2n}, provided the limit w exists in the sense thatfor all fine functions ф in the terminology of Jones [2], wherew1n(x) = wl(x)τ(x/n), W2n(x) = w2(x)τ(x/n)and τ is an infinitely differentiable function satisfying the following conditions:(i) τ(x) = τ(—x),(ii)0 ≤ τ (x) ≤ l,(iii)τ (x) = l for |x| ≤ ½,(iv) τ (x) = 0 for |x| ≥ 1.

scholarly journals Extensions of Opial’s inequality

1968 ◽  
Vol 26 (2) ◽  
pp. 215-232 ◽  
Author(s):  
Paul Beesack ◽  
Krishna Das
Keyword(s):  
Opial’S Inequality ◽  
Opial's Inequality
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