decidable vs expert

decidable

adj
  • capable of being decided. 

  • in intuitionistic logic, a proposition P is decidable in a given theory if it can be proven from the theory that "either P or not P", i.e. in symbols: P∨¬P. 

  • describing a set for which there exists an algorithm that will determine whether any element is or is not within the set in a finite amount of time. 

expert

adj
  • Extraordinarily capable or knowledgeable. 

  • Characteristic of an expert. 

noun
  • A player ranking just below master. 

  • A person with extensive knowledge or ability in a given subject. 

How often have the words decidable and expert occurred in a corpus of books? (source: Google Ngram Viewer )