Advent version theorists have frequently joked in recent times that the a part of mathemat- ical common sense referred to as "pure version idea" (or balance theory), in preference to the older and extra conventional "model conception utilized to algebra" , seems to have an increasing number of to do with different matters ofmathematics and to yield gen- uine functions to combinatorial geometry, differential algebra and algebraic geometry. We illustrate this through proposing the very remarkable program to diophantine geometry because of Ehud Hrushovski: utilizing version concept, he has given the 1st facts legitimate in all features of the "Mordell-Lang conjecture for functionality fields" (The Mordell-Lang conjecture for functionality fields, magazine AMS nine (1996), 667-690). extra lately he has additionally given a brand new (model theoretic) facts of the Manin-Mumford conjecture for semi-abelian types over a host box. His proofyields the 1st potent sure for the cardinality ofthe finite units concerned (The Manin-Mumford conjecture, preprint). there were earlier circumstances of purposes of version thought to alge- bra or quantity thought, yet those appl~cations had in universal the characteristic that their proofs used loads of algebra (or quantity concept) yet merely very uncomplicated instruments and effects from the version concept facet: compactness, first-order definability, simple equivalence...
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