axiom vs canonical form

axiom

noun
  • A fundamental assumption that serves as a basis for deduction of theorems; a postulate (sometimes distinguished from postulates as being universally applicable, whereas postulates are particular to a certain science or context). 

  • A seemingly self-evident or necessary truth which is based on assumption; a principle or proposition which cannot actually be proved or disproved. 

  • An established principle in some artistic practice or science that is universally received. 

canonical form

noun
  • A standard or normal presentation of a mathematical entity or a text string, etc. 

  • Any of a set of representations of the resonance structure of a molecule each of which contributes to the real structure; a contributing structure. 

  • Synonym of dictionary form 

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