**Doubly special relativity** (DSR)— also called **deformed special relativity** or, by some, **extra-special relativity** — is a modified theory of special relativity in which there is not only an observer-independent maximum velocity (the speed of light), but an observer-independent maximum energy scale and minimum length scale (the Planck energy and Planck length).

Read more about Doubly Special Relativity: History, Main, Predictions, De Sitter Relativity

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### Famous quotes containing the words relativity, doubly and/or special:

“By an application of the theory of *relativity* to the taste of readers, to-day in Germany I am called a German man of science, and in England I am represented as a Swiss Jew. If I come to be regarded as a bête noire the descriptions will be reversed, and I shall become a Swiss Jew for the Germans and a German man of science for the English!”

—Albert Einstein (1879–1955)

“A man calumniated is *doubly* injured—first by him who utters the calumny, and then by him who believes it.”

—Herodotus (c. 484–425 B.C.)

“With a generous endowment of motherhood provided by legislation, with all laws against voluntary motherhood and education in its methods repealed, with the feminist ideal of education accepted in home and school, and with all *special* barriers removed in every field of human activity, there is no reason why woman should not become almost a human thing. It will be time enough then to consider whether she has a soul.”

—Crystal Eastman (1881–1928)