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Phase line (mathematics)
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Phase line (mathematics) : ウィキペディア英語版
Phase line (mathematics)

In mathematics, a phase line is a diagram that shows the qualitative behaviour of an autonomous ordinary differential equation in a single variable, \tfrac = f(y). The phase line is the 1-dimensional form of the general n-dimensional phase space, and is very simple to analyze.
== Diagram ==
A line, usually vertical, represents an interval of the domain of the derivative. The critical points (i.e., roots of the derivative, points y such that f(y) = 0) are indicated, and the intervals between the critical points have their signs indicated with arrows: an interval over which the derivative is positive has an arrow pointing in the positive direction along the line (up or right), and an interval over which the derivative is negative has an arrow pointing in the negative direction along the line (down or left). The phase line is identical in form to the line used in the first derivative test, other than being drawn vertically instead of horizontally, and the interpretation is virtually identical, with the same classification of critical points.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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