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==Motivations==
===Algebraic number theory===
One motivation for '''F'''<sub>1</sub> comes from [[algebraic number theory]]. Weil's proof of the [[Riemann hypothesis for curves over finite fields]] starts with a curve ''C'' over a finite field ''k'', which comes equipped with a [[Function field of an algebraic variety|function field]] ''F'', which is a [[field extension]] of ''k''. Each such function field gives rise to a [[Hasse–Weil zeta function]] {{math|ζ<sub>''F''</sub>}}, and the Riemann hypothesis for finite fields determines the zeroes of {{math|ζ<sub>''F''</sub>}}. Weil's proof then uses
The field of rational numbers '''Q''' is linked in a similar way to the [[Riemann zeta function]], but '''Q''' is not the function field of a variety. Instead, '''Q''' is the function field of the [[scheme (mathematics)|scheme]] {{math|Spec '''Z'''}}. This is a one-dimensional scheme (a.k.a. an [[algebraic curve]]), and so there should be some "base field" which this curve lies over, of which '''Q''' would be a [[field extension]] (in the same way that ''C'' is a curve over ''k'', and ''F'' is an extension of ''k''). The hope of '''F'''<sub>1</sub>-geometry is that a suitable object '''F'''<sub>1</sub> could play the role of this base field, which would allow for a proof of the [[Riemann hypothesis]] by mimicking Weil's proof with '''F'''<sub>1</sub> in place of ''k''.
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