Abdelhak Hafdallah

5 Questions 2 Answers 0 Followers

Questions related from Abdelhak Hafdallah

Average of function in L^2, is it in L^2?

Let g(x,t) be a function which depends on two parameters, g is in L2 with respect to x, let G be its average with respect to t, my question is: does G belong to L2 with respect to x?

07 July 2016 2,093 10 View

Why always duality?

In functional analysis, partial differential equations, and many other branches of mathematics we use the concept of duality and dual spaces, dual operators,…, why duality has this big importance...

06 June 2016 9,879 1 View

Are there any definition or properties of Legendre transform on a subspace and not on the hole space as usual?

I have a problem when I should make a Legendre transform on a subspace ImG of a space Y both have an infinite dimension, I want to ask if there is any results about Legendre transform on a subspace?

03 March 2016 976 3 View

Wave equation with an overdetermined boundary conditions, are there any results about its existence?

HI, I get a wave equation with mixed overdetermined boundary conditions. I want to know if there is any results about existence or non-existence? NB: Read the attached file to see the full...

02 February 2016 5,316 1 View

Bounded linear operator with dense range, is it surjective?

Hi, I have a linear bounded operator A between tow Hilbert spaces with a dense domain and dense range, is it surjective? If the answer is no, are there more conditions on A to be surjective?

01 January 2016 1,089 6 View