[過去ﾛｸﾞ] 現代数学の系譜 工学物理雑談 古典ガロア理論も読む79 (1002ﾚｽ)
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404(1): 現代数学の系譜 雑談 古典ガロア理論も読む ◆e.a0E5TtKE [] 2019/12/14(土) 10:27:41.78 ID:s6Tab8iq(2/13) AAS
>>397
＞James Borger
https://ja.wikipedia.org/wiki/%E4%B8%80%E5%85%83%E4%BD%93
一元体 F1
Borger は有限体や整数環からdescentを用いて[8]、F1 を構成している。
[8]
Borger, James (2009), Λ-rings and the field with one element
https://en.wikipedia.org/wiki/Field_with_one_element
Field with one element F1
Borger used descent to construct it from the finite fields and the integers.[12]
[12]
https://arxiv.org/abs/0906.3146
https://arxiv.org/pdf/0906.3146.pdf
Λ-RINGS AND THE FIELD WITH ONE ELEMENT JAMES BORGER 2009
Abstract. The theory of Λ-rings, in the sense of Grothendieck’s Riemann?
Roch theory, is an enrichment of the theory of commutative rings. In the
same way, we can enrich usual algebraic geometry over the ring Z of integers
to produce Λ-algebraic geometry. We show that Λ-algebraic geometry is in a
precise sense an algebraic geometry over a deeper base than Z and that it has
many properties predicted for algebraic geometry over the mythical field with
one element. Moreover, it does this is a way that is both formally robust and
closely related to active areas in arithmetic algebraic geometry.
つづく
405(1): 現代数学の系譜 雑談 古典ガロア理論も読む ◆e.a0E5TtKE [] 2019/12/14(土) 10:28:37.87 ID:s6Tab8iq(3/13) AAS
>>404
つづき
Introduction
Many writers have mused about algebraic geometry over deeper bases than the
ring Z of integers. Although there are several, possibly unrelated reasons for this,
here I will mention just two. The first is that the combinatorial nature of enumeration formulas in linear algebra over finite fields Fq as q tends to 1 suggests that,
just as one can work over all finite fields simultaneously by using algebraic geometry over Z, perhaps one could bring in the combinatorics of finite sets by working
over an even deeper base, one which somehow allows q = 1. It is common, following Tits [60], to call this mythical base F1, the field with one element. (See also
Steinberg [58], p. 279.) The second purpose is to prove the Riemann hypothesis.
With the analogy between integers and polynomials in mind, we might hope that
Spec Z would be a kind of curve over Spec F1, that Spec Z ?F1 Z would not only
make sense but be a surface bearing some kind of intersection theory, and that we
could then mimic over Z Weil’s proof [64] of the Riemann hypothesis over function
fields.1 Of course, since Z is the initial object in the category of rings, any theory
of algebraic geometry over a deeper base would have to leave the usual world of
rings and schemes.
つづく
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