- #1
cedricyu803
- 20
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Homework Statement
Hello Guys, I am reading Hobson's General Relativity and I have come across an exercise problem, part of which frustrates me:
3.20 (P. 91)
In the 2-space with line element
[itex]ds^2=\frac{dr^{2}+r^{2}d\theta^{2}}{r^{2}-a^{2}}-\frac{r^{2}dr^{2}}{{(r^{2}-a^{2})}^{2}}
[/itex]
and given [itex]r{\frac{d\theta}{dr}}=tan\phi [/itex]
show that the space is mapped to a Euclidean plane in which (r, phi) are taken as polar coordinates.
Homework Equations
The Attempt at a Solution
So I attempted to express [itex]d\theta [/itex] as a l.c. of dr and dphi, but I don't know how to handle the [itex]\frac{d\theta}{dr}[/itex] the given relation [itex]r{\frac{d\theta}{dr}}=tan\phi [/itex]
to express the [itex]d\theta[/itex] in given line element in terms of dphi and dr
Thanks for any help =]