# Ex 0.2.5 in Sachs and Wu's textbook.

1. Apr 16, 2013

### MathematicalPhysicist

In the next attachements are:
1. Exercise 0.2.5 which I want help with.

2. Proposition 0.2.1 and its proof.

Now, basically a few things are changed in the theorem, I don't think I can use here the definition of s(t) in the proof of prop0.2.1 cause its s(t)=0, I don't think I can use this trick here.

Other thoughts that I had, obviously if I plug m=0 into prop0.2.1 I get that I should have:
$$\frac{d\gamma^1}{du}=\pm \frac{d\gamma^2}{du}$$, and $$\frac{d\gamma^2}{du}=a$$.

My question is how do I satisfy condition b in the theorem, I guess this x should be $$\pm Id +constant$$

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