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Difference between revisions of "Polish space"

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(copy short text from Descriptive set theory)
(Define Suslin space)
 
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by those logicians who identify  $  \mathbf N $
 
by those logicians who identify  $  \mathbf N $
 
and the first infinite [[ordinal number]]  $  \omega $).
 
and the first infinite [[ordinal number]]  $  \omega $).
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 +
A '''Suslin space''' is a continuous image of a Polish space.

Latest revision as of 19:36, 1 January 2021

A separable topologically complete space. Polish spaces form a natural frame of descriptive set theory. The fundamental Polish space $ \mathbf I $ of irrationals is homeomorphic to the Baire space $ \mathbf N ^ {\mathbf N} $( often denoted by $ \omega ^ \omega $ by those logicians who identify $ \mathbf N $ and the first infinite ordinal number $ \omega $).

A Suslin space is a continuous image of a Polish space.

How to Cite This Entry:
Polish space. Encyclopedia of Mathematics. URL: http://encyclopediaofmath.org/index.php?title=Polish_space&oldid=51151