View source for Q.e.d.

{{also|Q.E.D.}}
==English==

===Phrase===
{{head|en|phrase}}

# {{alternative case form of|en|Q.E.D.}}
#* {{quote-book|en|chapter=The Mathematical Repository, Nº 63|title=The Gentleman’s Diary, or The Mathematical Repository; an Almanack for the Year of Our Lord 1803:{{nb...|Being the Seventh after Bissextile. Containing Many Useful and Entertaining Particulars, peculiarly Adapted to the Ingenious Gentlemen Engaged in the Study and Practice of the Mathematicks. The Sixty-third Almanack Published of this Kind; and the Fifty-first of the New Style in England.}}|location=London|publisher=Printed for the [[w:Worshipful Company of Stationers and Newspaper Makers|Company of Stationers]] by [[w:John Nichols (printer)|Nichols and Son]],{{nb...|Red Lion Passage, Fleet-street.}}; [a]nd sold by George Greenhill,{{nb...|Treasurer to the Company, at their Hall, Ludgate-Street.}}|year=1803|page=33|pageurl=https://books.google.com/books?id=pyMsAAAAMAAJ&pg=PA33|oclc=225667331|passage=Now let any right line meet four harmonicals in <math>A</math>, <math>C</math>, <math>B</math>, <math>D</math>, and if thoſe harmonicals be parallel, the thing is evident; but, if they interſect in V, draw <math>ECF</math> parallel to <math>VD</math>, the line moſt remote from <math>C</math>; then, by the firſt part, <math>EC = CF</math>, and <math>AD:AC::VD:EC</math> or <math>CF</math>. Therefore <math>AD:AC::BD:CB</math>. '''q.e.d.'''}}
#* {{quote-book|en|author=Benedict de Spinoza [''i.e.'', {{w|Baruch Spinoza}}]; R[obert] Willis|chapter=[The [[w:Ethics (Spinoza)|Ethics]].] Part I.—Of God.|title=Benedict de Spinoza; His Life, Correspondence, and Ethics|location=London|publisher=[[w:Nicholas Trübner|Trübner & Co.]],{{nb...|60, Paternoster Row.}}|year=1870|page=418|pageurl=https://books.google.com/books?id=isIwAAAAYAAJ&pg=PA418|oclc=1021877894|passage=Prop[osition] VI. One substance cannot be produced by another substance. ''Demonst''[''ration'']. In the preceding proposition we have seen that there cannot in the nature of things be two Substances of the same attributes, or that they have anything in common (by Prop. II.); and so (by Prop. III.) one cannot be the cause of, or be produced by, another: '''q.e.d.'''}}

===Anagrams===
* {{anagrams|en|a=deq|DEQ}}