Lambda-rings and the field with one element
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The theory of Lambda-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 Lambda-algebraic geometry. We show that Lambda-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.
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Hyper-Operations and Extension of Scalars from $\mathbb{F}_1$ to $\mathbb{Z}$
A left adjoint extension-of-scalars functor from F1-modules to abelian groups strictifies hyper-operations into classical addition and extends to an adjunction between F1-algebras and commutative rings.
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