Notation question

  • #1
theperthvan
184
0
Hi, Just a question on notation. What does [tex]F(\frac{y}{x}) [/tex] mean?

It is in the context of..."the differential equation [tex] y' = F(\frac{y}{x}) [/tex] can be solved dadadadada........"

Cheers,
 

Answers and Replies

  • #2
slider142
1,015
70
It just means the right-hand side is a function of y/x. This could be a constant function, like F(y/x)=0, which would be trivial and silly, or something like F(y/x) = (y/x)^2 + (1/2)(y/x). Basically, if you can rearrange the right-hand side of the equation to explicitly be a function of y/x, whatever follows in your text will hold.
For example, if you have the equation y' = x + 2, there is no way to write the right-hand side as a function of y/x. Writing it as y' = x*(y/x)*(y/x)^(-1) + 2 still includes x independently, so whatever follows that sentence in your book will not work for this type of equation.
 

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