Source: An Introduction To Probability Theory And Its Applications (Third Edition), Chapter IX, Random Variables; Expectation, p. 212.
“I... interpret mechanics as a theory of relations between variables, rather than the theory of the evolution of variables in time.”
"Forget time" (Aug, 2008)
Help us to complete the source, original and additional information
Carlo Rovelli 21
Italian physicist 1956Related quotes

Kosmos (1932), Above is Beginning Quote of the Last Chapter: Relativity and Modern Theories of the Universe -->
Source: General System Theory (1968), 4. Advances in General Systems Theory, p. 96, as cited in: Vincent Vesterby (2013) From Bertalanffy to Discipline-Independent-Transdisciplinarity http://journals.isss.org/index.php/proceedings56th/article/viewFile/1886/672

Source: Principles of Economics (1998-), Ch. 2. Thinking Like an Economist; p. 30

[The Large-scale Structure of the Universe, 1980, Princeton Universe Press, xii, https://books.google.com/books?id=O_BPaHFtX1YC&pg=PR12]

Source: An approach to general systems theory (1969), p. 40.
Source: Perspective on the nature of geography (1958), p. 21
Source: Perspective on the nature of geography (1958), p. 47

Source: "Money and Finance in the Macro-Economic Process" (1982), p. 12