In mathematics, the **structure space** of a commutative Banach algebra is an analog of the spectrum of a C*-algebra. It consists of all multiplicative linear functionals on the algebra. The Gelfand representation of the Banach algebra is a map taking the Banach algebra elements to continuous functions on the structure space.

### Famous quotes containing the words space and/or structure:

“In the United States there is more *space* where nobody is is than where anybody is.”

—Gertrude Stein (1874–1946)

“Agnosticism is a perfectly respectable and tenable philosophical position; it is not dogmatic and makes no pronouncements about the ultimate truths of the universe. It remains open to evidence and persuasion; lacking faith, it nevertheless does not deride faith. Atheism, on the other hand, is as unyielding and dogmatic about religious belief as true believers are about heathens. It tries to use reason to demolish a *structure* that is not built upon reason.”

—Sydney J. Harris (1917–1986)