Abstract
23. Let R be functional and let Y be any class. Let b be any element of R→(R←(Y)). Then there is an element a of R←(Y) such that (a,b) ∈ R. Since a ∈ R←(Y) there is an element y of Y such that (a,y) ∈ R. Since R is functional and both (a,b) and (a,y) belong to R it follows that b = y. So b ∈ Y.
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© 1998 Springer Science+Business Media New York
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Adamson, I.T. (1998). Answers to Chapter 3. In: A Set Theory Workbook. Birkhäuser, Boston, MA. https://doi.org/10.1007/978-0-8176-8138-8_17
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DOI: https://doi.org/10.1007/978-0-8176-8138-8_17
Publisher Name: Birkhäuser, Boston, MA
Print ISBN: 978-0-8176-4028-6
Online ISBN: 978-0-8176-8138-8
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