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Relative Stone-Weierstrass theorem for mappings between varieties
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We introduce a class of real algebraic varieties characterised by a simple rationality condition, which exhibit strong properties regarding approximation of continuous and smooth mappings by regular ones. They form a natural counterpart to the classes of malleable and quasi-malleable varieties. The approximation property studied here is stronger than those considered before and allows us to deduce non-trivial facts about extensions of regular mappings between varieties.
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Retract rational varieties are uniformly retract rational
Nonsingular retract rational varieties are uniformly retract rational, implying rational projective complex varieties are algebraically elliptic.
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