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Results tagged with lo.logic
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user 547731
first-order and higher-order logic, model theory, set theory, proof theory, computability theory, formal languages, definability, interplay of syntax and semantics, constructive logic, intuitionism, philosophical logic, modal logic, completeness, Gödel incompleteness, decidability, undecidability, theories of truth, truth revision, consistency.
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Morphisms of the additive group of a field of finite Morley rank
Problem solved, they are exactly the automorphisms $\psi$ of $K$ such that $\psi(H)=H$. Indeed $K=\langle H\rangle_+$ (since $H^0$ is indecomposable) and so $\psi(xy)=\psi(x)\psi(y)$ for any $x,y\in K …
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Morphisms of the additive group of a field of finite Morley rank
It is well-known that a definable field of finite Morley rank has no proper definable group of automorphisms (a proof can be found for example in the book "Stable groups" of Poizat). My question is: c …