Archivio Istituzionale della RicercaExamples are presented of $ \boldsymbol \Sigma^1_1$-universal preorders arising by requiring the existence of particular surjective functions. These are: the relation of epimorphism between countable graphs; the relation of being a continuous image (or a continuous image of some specific kind) for continua; the relation of being continuous open image for dendrites.
Universal analytic preorders arising from surjective functions / Camerlo, Riccardo. - In: FUNDAMENTA MATHEMATICAE. - ISSN 0016-2736. - 187:(2005), pp. 193-212.
Universal analytic preorders arising from surjective functions
CAMERLO, RICCARDO
2005
Abstract
Examples are presented of $ \boldsymbol \Sigma^1_1$-universal preorders arising by requiring the existence of particular surjective functions. These are: the relation of epimorphism between countable graphs; the relation of being a continuous image (or a continuous image of some specific kind) for continua; the relation of being continuous open image for dendrites.
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https://hdl.handle.net/11583/1398388
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