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How are arbitrary constants different from fixed constants?


Asked by Ricardo Parker on Dec 01, 2021 FAQ



Look a arbitrary constant is different and a constant is different. Arbitrary constant can take any value it does not depend on any thing. On the other hand constant can have just a fixed value. For example:- there is a eq 3X+5=8 so here X can take only one value so it is constant.
Also Know,
Also, the constants are properties of the system described by the differencial equation (the elasticity of a material or the mass of a pendulum, etc...), while the arbitrary constants give diferent solutions depending on the initial conditions of the system (for example, the initial phase of a mass connected to a spring).
Next, Then, the equation doesn't have any arbitrary constants at all. It would become x 2 + y 2 − 2 r y = 0 or x 2 + y 2 + 2 r y = 0 so it would be a fixed equation and not having any arbitrary constants. So how would we have a differential equation for it? And by my understanding it itself would be the differential equation with degree = 0
In this manner,
Eliminate the arbitrary constants c 1 and c 2 from the relation y = c 1 e − 3 x + c 2 e 2 x. Note: The methods of elimination vary with the way in which the constants enter the given relation.
Also,
Equations (2.68) contain three arbitrary constants a0, a1, f1, which determine a three-parametric group with the operators and two arbitrary time-dependent functions f, S, which specify an infinite subgroup of the main group