Gradient Descent and Cauchy Method in Differential Equations

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SUMMARY

The discussion focuses on the application of the Cauchy method in differential equations, specifically addressing the use of the variable theta (Θ) in the context of gradient descent. The variable X represents the derivative with respect to x, and the expression α = -θX indicates a negative adjustment along the tangent plane as θ approaches zero. This approach is crucial for understanding the movement towards the point (x_0, y_0, z_0) along the path defined by the differential equation.

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kidsasd987
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http://www.math.uiuc.edu/documenta/vol-ismp/40_lemarechal-claude.pdf



I don't understand why we use theta for equation (1)

Θ>0

but why α=-θX?



Thanks.
 
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It was already given that X is the derivative with respect to x and so [itex]\theta X[/itex] is gives a slight change along the tangent plane in the x direction. I presume it is negative because they want to think of [itex]\theta[/itex] going to 0 as the point, [itex](x_0- \theta X, y_0- \theta Y, z_0-\theta Z)[/itex], moving toward [itex](x_0, y_0, z_0)[/itex] along the path defined by the differential equation.
 
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