Automorphisms of the hyperreals over the rationals and nontrivial automorphism groups
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A classic result says the automorphism group of R R (over Q Q ) is trivial. The proof is simple: every automorphism preserves squares, and hence fixes ...
from Algebra
A classic result says the automorphism group of R R (over Q Q ) is trivial. The proof is simple: every automorphism preserves squares, and hence fixes ...
from Algebra
