I'm writing a paper in which I cite a lot of results that appear in Schikhof's *Ultrametric Calculus*. Some of these results are exercises in Schikhof's book. These exercises are not difficult, but are laborious. Thus, if I write the proofs, the article may extend by about two or three pages.

Should I write the proofs or simply cite them? Schikhof is a very well respected mathematician, and I have never found any errors in his book. Obviously, I have checked that the exercises are correct.

(If it were one exercise, I would write the proof in my article, as I have seen in other articles, but in my case there are about five exercises.)

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