Related Clues:

• Logical abbr.
• Math proof letters
• Letters from a mathematician
• Conclusion letters
• Proof finisher
• 'And that proves it'
• Letters seen during proofreading?
• Argument ender
• Letters concluding a proof
• Letters at the end of a math dissertation, perhaps
• 'Proved!' letters
• Math proof ending
• Ending letters
• Logician's 'ta-da!'
• Proof finish