# Symbols:Abbreviations/Q

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## Q

### QED

The initials of **Quod Erat Demonstrandum**, which is Latin for **which was to be demonstrated**.

These initials were traditionally added to the end of a proof, after the last line which is supposed to contain the statement that was to be proved.

### QEF

The initials of **Quod Erat Faciendum**, which is Latin for **which was to be done**.

These initials were traditionally added to the end of a geometric construction.

### QEI

The initials of **Quod Erat Inveniendum**, which is Latin for **which was to be found**.

These initials were traditionally added after the completion of a calculation (either arithmetic or algebraic).