Let X be a Hilbert space of square-integrable measurable functions on\\ Omega\\ subset\\ mathbb ^ N.
Let\\ Omega\\ subset\\ mathbb ^ N. Let X be a Hilbert space.
Let X be a Hilbert space. Let\\ Omega\\ subset\\ mathbb ^ N.
Let X be a Hilbert space. Let\\ Omega\\ subset\\ mathbb ^ N.