I've the following problem. I have two four-vectors p and q where p is timelike ([tex] p^{2} > 0 [/tex]) and q is spacelike([tex] q^{2} < 0 [/tex]).(adsbygoogle = window.adsbygoogle || []).push({});

Now I should consider the quantity

[tex] - \dfrac{2 (pq)^{2} + p^{2} q^{2}}{q^{2}} [/tex]

and compute the limit [tex] q \to 0 [/tex].

But I don't know how to perform the limit procedure. Could anyone help me please?

I already tried to consider the problem in a special frame with [tex] p=(p^{0}, \vec{0}) [/tex] but it doesn't help.

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# Homework Help: Limit computation

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