decidable vs expedient

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. 

expedient

adj
  • Suitable to effect some desired end or the purpose intended. 

  • Governed by self-interest, often short-term self-interest. 

  • Affording short-term benefit, often at the expense of the long-term. 

noun
  • A method or means for achieving a particular result, especially when direct or efficient; a resource. 

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