Related Clues:

• Mathematical proposition proved by reasoning
• Hero met (anag) — principle that's proven
• Generally accepted proposition
• Self-evident proposition
• Formulaic rule
• Statement assumed to be true from which a conclusion can be drawn
• Byzantine Empire's assumption
• Geometry staple
• Proposition assumed to be self-evident
• Corollary's kin
• Principle aside, love to get married!
• Mathematical stepping stone
• It's more the difficult matter to be proved
• Proposition
• Article more unlikely, it being unproven?