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, QED is 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. (el) (Ó.É.D)  (όπερ έδει δείξαι)
• Hebrew: מ.ש.ל. (he) (מה שהיה להוכיח) m pl
• Hindi: इ. सि. (hi) (इति सिद्धम्)
• 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) (č. t. d.), 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

---

Latin

Wikipedia ^la

Initialism

QED

1. QED