# Math Help - degree of differential equation

1. ## degree of differential equation

what can be degree of differential equation $e^{\frac{dy}{dx}}=2$
my working
if I expand $e^t$where $t={\frac{dy}{dx}}$ then degree seems to be not defined as $t$goes up to infinity but if i take ln(natural log)on both sides then degree seems to be 1
as we get ${\frac{dy}{dx}}=ln2$ where is the problem ? is modification changed the equation in other form[/quote]

2. ## Re: degree of differential equation

Yes, that is a first order differential equation.

Even in the first form, $e^{dy/dx}= 2$ there is only a first order derivative.

Even if you expand in a power series:
$1+ \frac{dy}{dx}+ \frac{1}{2!}\left(\frac{dy}{dx}\right)^2+ \frac{1}{3!}\left(\frac{dy}{dx}\right)^3+ \cdot\cdot\cdot$
You have only the first derivative! The powers of that first derivative give the degree not the order- it is still first order.

3. ## Re: degree of differential equation

Originally Posted by HallsofIvy
Yes, that is a first order differential equation.

Even in the first form, $e^{dy/dx}= 2$ there is only a first order derivative.

Even if you expand in a power series:
$1+ \frac{dy}{dx}+ \frac{1}{2!}\left(\frac{dy}{dx}\right)^2+ \frac{1}{3!}\left(\frac{dy}{dx}\right)^3+ \cdot\cdot\cdot$
You have only the first derivative! The powers of that first derivative give the degree not the order- it is still first order.
sir I am taking about degree according to our book degree and order are two different terminology.sir see this General Terms of Ordinary Differential Equations

4. ## Re: degree of differential equation

ir i am confused in order and degree as given in link above .please clear my doubt