Souslin quasi-orders and bi-embeddability of uncountable structures
Souslin quasi-orders and bi-embeddability of uncountable structures
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不可数结构的苏斯林拟序和双嵌入性
DOI:
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发表时间:
2016
影响因子:
1.9
通讯作者:
L. Ros
中科院分区:
文献类型:
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作者:
Alessandro Andretta;L. Ros
<p>We provide analogues of the results from Friedman and Motto Ros (2011) and Camerlo, Marcone, and Motto Ros (2013) (which correspond to the case <inline-formula content-type="math/mathml">
<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" alttext="kappa equals omega">
<mml:semantics>
<mml:mrow>
<mml:mi>κ<!-- κ --></mml:mi>
<mml:mo>=</mml:mo>
<mml:mi>ω<!-- ω --></mml:mi>
</mml:mrow>
<mml:annotation encoding="application/x-tex">kappa = omega</mml:annotation>
</mml:semantics>
</mml:math>
</inline-formula>) for arbitrary <inline-formula content-type="math/mathml">
<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" alttext="kappa">
<mml:semantics>
<mml:mi>κ<!-- κ --></mml:mi>
<mml:annotation encoding="application/x-tex">kappa</mml:annotation>
</mml:semantics>
</mml:math>
</inline-formula>-Souslin quasi-orders on any Polish space, for <inline-formula content-type="math/mathml">
<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" alttext="kappa">
<mml:semantics>
<mml:mi>κ<!-- κ --></mml:mi>
<mml:annotation encoding="application/x-tex">kappa</mml:annotation>
</mml:semantics>
</mml:math>
</inline-formula> an infinite cardinal smaller than the cardinality of <inline-formula content-type="math/mathml">
<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" alttext="double-struck upper R">
<mml:semantics>
<mml:mrow class="MJX-TeXAtom-ORD">
<mml:mi mathvariant="double-struck">R</mml:mi>
</mml:mrow>
<mml:annotation encoding="application/x-tex">mathbb {R}</mml:annotation>
</mml:semantics>
</mml:math>
</inline-formula>. These generalizations yield a variety of results concerning the complexity of the embeddability relation between graphs or lattices of size <inline-formula content-type="math/mathml">
<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" alttext="kappa">
<mml:semantics>
<mml:mi>κ<!-- κ --></mml:mi>
<mml:annotation encoding="application/x-tex">kappa</mml:annotation>
</mml:semantics>
</mml:math>
</inline-formula>, the isometric embeddability relation between complete metric spaces of density character <inline-formula content-type="math/mathml">
<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" alttext="kappa">
<mml:semantics>
<mml:mi>κ<!-- κ --></mml:mi>
<mml:annotation encoding="application/x-tex">kappa</mml:annotation>
</mml:semantics>
</mml:math>
</inline-formula>, and the linear isometric embeddability relation between (real or complex) Banach spaces of density <inline-formula content-type="math/mathml">
<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" alttext="kappa">
<mml:semantics>
<mml:mi>κ<!-- κ --></mml:mi>
<mml:annotation encoding="application/x-tex">kappa</mml:annotation>
</mml:semantics>
</mml:math>
</inline-formula>.</p>