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Spinoza Ethica Pars1 Prop1
Spinoza's original text of Ethics, Part 1. Q.E.D. is used at the end of DEMONSTRATIO of PROPOSITIO III. in the right page.

Q.E.D. is an acronym or initialism of the Latin phrase quod erat demonstrandum, which means "what was to be demonstrated," In other words, Q.E.D. means "something was to be proven, and now it has been done".

History

In the European Renaissance, scholars often wrote in Latin. The phrases Q.E.D. was often used at the end of mathematical or philosophical proofs.

Equivalents in other languages

Q.E.D. is used in many languages, including:

Language Abbreviations Stands for...
Arabic و.هـ.م وهو المطلوب إثباته
Bengali অ. সি. অতঃ সিদ্ধ
Croatian Š.T.D. što je trebalo dokazati
Czech C.B.D. což bylo dokázati
Estonian M.O.T.T. mida oligi tarvis tõestada
Finnish M.O.T. mikä on todistettu
French C.Q.F.D. ce qu'il fallait démontrer
German w.z.b.w. was zu beweisen war
Greek Ο.Ε.Δ. όπερ έδει δείξαι
Italian C.V.D. come volevasi dimostrare
Hebrew .מ.ש.ל מה שצריך להוכיח
Hindi इ.सि. इति सिद्धम्
Polish c.b.d.u. co było do udowodnienia
Portuguese C.Q.D. como queríamos demonstrar
Russian ч.т.д. что и требовалось доказать
Serbian ш.т.д. што је и требало доказати
Slovenian q.e.d (quonc)/konc enga dokaza
Tamil நி.வே. நிரூபிக்கப்படவேண்டியது
Thai ซ.ต.พ. ซึ่งต้องพิสูจน์
Hungarian E.K.B. Ezt kellett bizonyítani
Spanish Q.E.D. queda entonces demostrado
queda esto demostrado
Swedish V.S.B.
V.S.V
vilket skulle bevisas
vilket skulle visas
Vietnamese đpcm. Điều phải chứng minh
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