# Can somebody explain me this?

Kruger
I postet the formula below (attachment). I don't know how we can get from the first step to the second. I mean why does that n fall "out" of the square root?

#### Attachments

• integra.bmp
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## Answers and Replies

Science Advisor
Step 1a, let v=u+n2, then lower limit of v is n2
Step 1b, let u=v

I presume w is independent of u.