Related Clues:

• ''What goes up must come down,'' e.g.
• Supporting premise
• Proven proposition, in math
• Universally accepted principle
• Math proposition
• It's assumed
• Logician's starting point
• Prove it
• 'Power corrupts,' e.g.
• Subject indicated in a heading
• Assumption for the sake of argument
• Subsidiary math theorem
• Geometry postulate
• "If it ain't broke, don't fix it," e.g.
• Like some conditional statements