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While reading V.I.Danilov's book, "Algebraic curves, algebraic manifolds, and schemes", I get stuck on page 284 about the figure illustrating below. It illustrates the numbers 3, 5 and 6 as functions on SpecZ. But according to my understanding, I think the figure has a minor error, since the function of 5 at (2) would take value to 1 (for [tex] 5\equiv 1(mod 2)[/tex]), while the book depictes the value as 0, is it wrong? I am not sure about that. I hope someone would confirm or deny my opinion.

[PLAIN]http://stashbox.org/996759/Spec.jpg [Broken]

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# Functions on the Spectrum

Can you offer guidance or do you also need help?

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