- #1

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Equation (2.5) is often expressed equivalently as some function of ##t - x/v)##, since,

$$f(x-vt)=F(-\frac{x-vt}{v})=F(t-\frac{x}{v})$$

What I am trying to understand is the relevance of this, because he make no mentioned to this again in the chapter nor dose he refer to it in any of the exercise at then end, and just curious to now when this type of format would be used?

edit: the equation 2.5 he is referring to is: ##\psi(x)=f(x-vt)##