Examples are presented of $ oldsymbol 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
2005-01-01
Abstract
Examples are presented of $ oldsymbol 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.File in questo prodotto:
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