While non-relativistic time is the observable quantity measured (or approximated) by physical clocks, in general relativity clocks measure s along their worldline, not t. The relativistic... t is a freely chosen label with no direct physical interpretation. ...The physical content of a solution of Einstein's equations is not in its dependence on t, but ...in what remains once the dependence on t (and x) has been factored away.
Carlo RovelliRelated topics
chosen content dependence direct general interpretation label measure observable once physical quantity relativity solution time while remains clocks worldlineRelated quotes
To renew the energy expended in physical labour, the worker must be provided with the requirements of his existence as a functioning organism-food, clothing, and shelter for himself and his family. The labour time socially necessary to produce the necessities of life of the worker is the value of the worker's labour power. The latter's value is, therefore, reducible to a specifiable quantity of commodities: those which the worker requires to be able to subsist and reproduce.
Anthony Giddens
My enduring feeling about René Lévesque is that if he had chosen to hang me, even as he tightened the rope round my neck, he would have complained about how humiliating it was for him to spring the trapdoor. And then, once I was swinging in the wind, he would blame my ghost for having obliged him to murder, thereby imposing a guilt trip on a sweet, self-effacing, downtrodden Francophone.
Mordecai Richler
THERE is scarcely any inquiry more curious, or, from its importance, more worthy of attention, than that which traces the causes which practically check the progress of wealth in different countries, and stop it, or make it proceed very slowly, while the power of production remains comparatively undiminished, or at least would furnish the means of a great and abundant increase of produce and population.
Thomas Malthus
Whole great chunks of written history are of little value to the psychohistorian, while other vast areas which have been much neglected by historians - childhood history, content analysis of historical imagery, and so on - suddenly expand from the periphery to the center of the psychohistorian's conceptual world, simply because his or her own new questions require material nowhere to be found in history books.
Lloyd deMause
Science is not sacrosanct. The mere fact that it exists, is admired, has results is not sufficient for making it a measure of excellence. Modern science arose from global objections against earlier views and rationalism itself, the idea that there are general rules and standards for conducting our affairs, affairs of knowledge included, arose from global objections to common sense.
Paul Karl Feyerabend
