Advent version theorists have usually joked lately that the a part of mathemat- ical good judgment referred to as "pure version thought" (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 offering the very amazing software to diophantine geometry as a result of Ehud Hrushovski: utilizing version thought, he has given the 1st evidence 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 powerful certain for the cardinality ofthe finite units concerned (The Manin-Mumford conjecture, preprint). there were earlier situations of purposes of version conception to alge- bra or quantity thought, yet those appl~cations had in universal the characteristic that their proofs used loads of algebra (or quantity thought) yet in simple terms very simple instruments and effects from the version conception part: compactness, first-order definability, straight forward equivalence...

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