QED

English

Wikipedia

Etymology

Initialisms.

Interjection

QED

1. Quod erat demonstrandum (Latin what had to be proved or what was to be demonstrated).

Usage notes

When used to end a mathematical proof, somewhat archaic or traditional; textbooks often use a graphical symbol instead. Further, other languages generally use a vernacular abbreviation, such as French CQFD (“ce qu'il fallait démontrer”); QED is primarily used in English and Hungarian.

Related terms

• (what was to be demonstrated): QEF

Translations

quod erat demonstrandum

Czech: c.b.d. (cs) (co bylo dokázat) Esperanto: KEP (eo) (kio estis pruvota) Finnish: MOT (fi) (mikä oli todistettava) French: CQFD (fr) (ce qu'il fallait démontrer) German: w.z.b.w. (de) (was zu beweisen war) Greek: ό.έ.δ. (όπερ έδει δείξαι) Hebrew: מ.ש.ל. (he) (מה שהיה להוכיח) m. pl. Icelandic: þ.s.s.á. (is) (það sem sanna átti) Italian: CVD (come volevasi dimostrare)

Japanese: 証明終わり (しょうめいおわり, shōmei owari) Polish: c.b.d.o. (pl) (co było do okazania), c.b.d.u. (pl) (co było do udowodnienia) Portuguese: C.Q.D., (written out) como queríamos demonstrar, c.q.d. (pt) Russian: ч. т. д. (ru), что и требовалось доказать (što i trébovalos’ dokazát’) Slovak: Č.B.T.D. (čo bolo treba dokázať) Spanish: C.Q.D., (written out) como queríamos demostrar Swedish: VSV (sv) (vilket skulle visas), VSB (sv) (vilket skulle bevisas) Vietnamese: DPCM

Noun

QED

1. Quantum electrodynamics.
   • 2011, Brian Cox & Jeff Forshaw, The Quantum Universe, Allen Lane 2011, p. 176:

     QED is the theory that explains how electrically charged particles, like electrons, interact with each other and with particles of light (photons).

Related terms

• (quantum): QCD

Anagrams

• DEQ

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Latin

Wikipedia ^la

Initialism

QED

1. QED