Argument ender

• End-of-proof letters
• Geometry letters
• Peter Parnell play about physicist Richard Feynman
• Letters at the end of a math proof
• Calculus class letters
• Conclusive letters
• Proof-ending letters

Wikipedia Word definitions in Wikipedia
QED is a play by American playwright Peter Parnell which chronicles (part of) a day in the life of Nobel Prize-winning physicist Richard Feynman . It presents scenes from a day in Feynman's life, less than two years before his death, interweaving many strands ...

Wiktionary Word definitions in Wiktionary
alt. quod erat demonstrandum (Latin ''what had to be proved'' or ''what was to be demonstrated''). interj. quod erat demonstrandum (Latin ''what had to be proved'' or ''what was to be demonstrated''). n. quantum electrodynamics.