decidable vs equal

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. 

equal

adj
  • Adequate; sufficiently capable or qualified. 

  • Intended for voices of one kind only, either all male or all female; not mixed. 

  • The same in all respects. 

  • Exactly identical, having the same value. 

verb
  • To make equivalent to; to cause to match. 

  • To have as its consequence. 

  • To be equal to, to have the same value as; to correspond to. 

noun
  • A person or thing of equal status to others. 

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