On 06/09/17 03:11, michael.norr...@data61.csiro.au wrote: > This depends a little on what you mean by “find a type”. In the initial > state of HOL, there are two types (bool and ind), and one operator -> > (function space). The core axiomatization allows us to conclude that bool > has two elements, and that ind has at least aleph_0 many elements. Applying > the function operator generates a type that is strictly bigger than the > exponent/domain type. With these tools, it is clear that one cannot construct > a type with cardinality one. > > Yet, the predicate ?y. !x. x = y captures the idea of a type having just one > element. So, if I’m interpreting your question correctly, the answer is no.
Yes, this answers my question. Thanks you. -- Do not eat animals; respect them as you respect people. https://duckduckgo.com/?q=how+to+(become+OR+eat)+vegan
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