Related Clues:

• End of a proof
• Post-proof abbr.
• Conclusive letters
• Proof-ending abbr.
• Logical conclusion
• Abbr after a proof.
• Proof closer
• Math class abbr.
• Proof abbr.
• Mathematical proof letters
• Eye infection
• Letters after a proof
• Which was to be demonstrated
• Abbreviation in a proof
• Abbr. at the end of a proof