Possible Clues:

• Formula to be proved
• Arena excluding couple, American band supports that principle
• Proposition old soldiers introduced to those opposed to us
• There's love in monsieur's proposition
• Mathematical work, product of mine, seized by our opponents
• Theme or order? Prove it!
• Something proved at that point about zero mass
• Among others, our men regularly wanted deduction to be verified
• Proposition in article on Rome, possibly
• Demonstrable principle