| Answer | Crossword Clue |
|---|---|
| QED | Proof abbr. |
| QED | Proof-ending abbr. |
| QED | Latin proof abbr. |
| QED | Mathematical proof abbr. |
| QED | Math proof abbr. |
| QED | Proof letters (abbr.) |
| REC | Proof of payment: Abbr. |
| RCPT | Proof of purchase: Abbr. |
| RCT | Proof of purchase (abbr.) |
| QED | Geometric proof conclusion (abbr.) |
| RCPT | Proof of purchase (abbr.) |
| QED | End-of-proof abbr. |
| QED | Abbr. after a proof |
| IDS | Proof-of-age items: Abbr. |
| QED | Abbr. ending a math proof |
| QED | Abbr. at the end of a proof |
| QED | Abbr. that a proof reader might come across? |
