# Impulse

Rules

• An impulse always subdivides into five waves.
• Wave 1 always subdivides into an impulse or (rarely) a diagonal triangle.
• Wave 3 always subdivides into an impulse.
• Wave 5 always subdivides into an impulse or a diagonal triangle.
• Wave 2 always subdivides into a zigzag, flat or combination.
• Wave 4 always subdivides into a zigzag, flat, triangle or combination.
• Wave 2 never moves beyond the start of wave 1.
• Wave 3 always moves beyond the end of wave 1.
• Wave 3 is never the shortest wave.
• Wave 4 never moves beyond the end of wave 1.
• Never are waves 1, 3 and 5 all extended.

Guidelines

• Wave 4 will almost always be a different corrective pattern than wave 2.
• Wave 2 is usually a zigzag or zigzag combination.
• Wave 4 is usually a flat, triangle or flat combination.
• Sometimes wave 5 does not move beyond the end of wave 3 (in which case it is called a truncation).
• Wave 5 often ends when meeting or slightly exceeding a line drawn from the end of wave 3 that is parallel to the line connecting the ends of waves 2 and 4, on either arithmetic or semilog scale.
• The center of wave 3 almost always has the steepest slope of any equal period within the parent impulse except that sometimes an early portion of wave 1 (the “kickoff”) will be steeper.
• Wave 1, 3 or 5 is usually extended. (An extension appears “stretched” because its corrective waves are small compared to its impulse waves. It is substantially longer, and contains larger subdivisions, than the non-extended waves).
• Often, the extended subwave is the same number (1, 3 or 5) as the parent wave.
• Rarely do two subwaves extend, although it is typical for waves 3 and 5 both to extend when they are of Cycle or Supercycle degree and within a fifth wave of one degree higher.
• Wave 1 is the least commonly extended wave.
• When wave 3 is extended, waves 1 and 5 tend to have gains related by equality or the Fibonacci ratio.
• When wave 5 is extended, it is often in Fibonacci proportion to the net travel of waves 1 through 3.
• When wave 1 is extended, it is often in Fibonacci proportion to the net travel of waves 3 thorough 5.
• Wave 4 typically ends when it is within the price range of subwave four of 3.
• Wave 4 often subdivides the entire impulse into Fibonacci proportion in time and/or price.
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