The Linnaean hierarchy is a system of nested classes whose members are individual organisms. It will be the purpose of this paper to set out the logic of this system in a manner which is faithful to ...

Sign languages can help reveal hidden aspects of the logical structure of spoken language, but they also highlight its limitations because speech lacks the rich iconic resources that sign language ...

Given well ordered countable sets of the form $\Lambda_\phi$, we consider Borel mappings from $\Lambda_\phi^\omega$ with countable image inside the ordinals. The ordinals and $\Lambda_\phi^\omega$ are ...