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The Elliott wave principle, or Elliott wave theory, is a form of technical analysis that financial traders use to analyze financial market cycles and forecast market trends by identifying extremes in investor psychology and price levels, such as highs and lows, by looking for patterns in prices. Ralph Nelson Elliott (1871–1948), an American ...
Wave. Surface waves in water showing water ripples. In physics, mathematics, engineering, and related fields, a wave is a propagating dynamic disturbance (change from equilibrium) of one or more quantities. Periodic waves oscillate repeatedly about an equilibrium (resting) value at some frequency. When the entire waveform moves in one direction ...
45–60. This box: view. talk. edit. In economics, Kondratiev waves (also called supercycles, great surges, long waves, K-waves or the long economic cycle) are hypothesized cycle-like phenomena in the modern world economy. [ 1] The phenomenon is closely connected with the technology life cycle. [ 2] It is stated that the period of a wave ranges ...
In 1678, Huygens proposed that every point reached by a luminous disturbance becomes a source of a spherical wave; the sum of these secondary waves determines the form of the wave at any subsequent time. [2] He assumed that the secondary waves travelled only in the "forward" direction, and it is not explained in the theory why this is the case.
In political science, the waves of democracy or waves of democratization are major surges of democracy that have occurred in history. Although the term appears at least as early as 1887, [1] it was popularized by Samuel P. Huntington, a political scientist at Harvard University, in his article published in the Journal of Democracy and further expounded in his 1991 book, The Third Wave ...
1673 – Ignace Pardies provides a wave explanation for refraction of light. 1675 – Robert Boyle discovers that electric attraction and repulsion can act across a vacuum and do not depend upon the air as a medium. Adds resin to the known list of "electrics". 1675 – Isaac Newton delivers his theory of light.
The period (symbol T) is the interval of time between events, so the period is the reciprocal of the frequency: T = 1/f. [ 2 ] Frequency is an important parameter used in science and engineering to specify the rate of oscillatory and vibratory phenomena, such as mechanical vibrations, audio signals ( sound ), radio waves , and light .
Airy wave theory is a linear theory for the propagation of waves on the surface of a potential flow and above a horizontal bottom. The free surface elevation η(x,t) of one wave component is sinusoidal, as a function of horizontal position x and time t: (,) = where