(philosophy) The proposition that nothing happens without a sufficient reason why it should be as it is and not otherwise.

(historical) The political philosophy espoused by Sun Yat-sen and the Chinese Nationalist Party.

plural of dictionary on historical principles

(lexicography) A type of scholarly dictionary that displays the history of lexical items through citations.

(mathematics) A principle that gives a condition for finding the eigenvalues for a real symmetric matrix.

Synonym of principle of least astonishment

Synonym of principle of indifference

The principle that the parties in a transaction should be independent and on an equal footing, without any favorable treatment, fiduciary duties, etc.

A method of analysis applied to problems of wave propagation, stating that every point on a wavefront is itself the source of spherical wavelets, and the secondary wavelets emanating from different points mutually interfere.

(physics) also known as the stationary action principle. In complex systems, the tendency for any movement or change to use the least action, and therefore amount of energy possible. This is true on a subatomic level, on the population level (evolution), and on a macro level. Not considered a law of physics because it is not true 100% of the time.