QED
Logic's final punctuation
QED stands for the Latin phrase *quod erat demonstrandum*, meaning "which was to be demonstrated." It traditionally appears at the end of mathematical proofs to signal the argument is complete.
In casual use, QED marks the triumphant conclusion of any argument: She said she'd never date him. They're engaged now. QED.
Demonstrated logical conclusion
- demonstrationPublic display of opinion
- derivationSource or origin tracing
- lemmaBase form, or helper theorem
- corollaryLogical natural consequence
axiom · postulate · proposition · deduction · inference · rigorous · self-evident · establish
In this way
- thereforeFor that reason
- henceFor that reason
- ergoTherefore, in Latin
- accordinglyIn response to that
- photonElectromagnetic radiation unit
- electronNegative subatomic particle
- interactionReciprocal action between parties
- DysonPremium vacuum manufacturer
theorem
Demonstrated logical conclusion
- demonstrationPublic display of opinion
- derivationSource or origin tracing
- lemmaBase form, or helper theorem
corollary · axiom · postulate · proposition · deduction · inference · rigorous · self-evident · establish · verify
thus
In this way
Feynman
- photonElectromagnetic radiation unit
- electronNegative subatomic particle
- interactionReciprocal action between parties
QEDdisproven
Shown by evidence false
unproven · conjecture · undemonstrated · refuted · falsified
QEDpremise
Foundation for logical argument
claim · postulate · hypothesis · proposition · axiom
QEDrefuted
Proved an argument false
disproven · contradiction · fallacy · non sequitur · invalid