In physics and chemistry a selection rule, or transition rule, formally constrains the possible transitions of a system from one state to another. Selection rules have been derived for electronic, vibrational, and rotational transitions. The selection rules may differ according to the technique used to observe the transition.
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Famous quotes containing the words selection and/or rule:
“Every writer is necessarily a criticthat is, each sentence is a skeleton accompanied by enormous activity of rejection; and each selection is governed by general principles concerning truth, force, beauty, and so on.... The critic that is in every fabulist is like the icebergnine-tenths of him is under water.”
—Thornton Wilder (18971975)
“Democracy dont rule the world,
Youd better get that in your head;
This world is ruled by violence
But I guess thats better left unsaid.”
—Bob Dylan [Robert Allen Zimmerman] (b. 1941)