whatis mean by Q.E.D

Q.E.D is the short form of Quite Easily Done. 

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Q.E.D." (sometimes written "QED") is an abbreviation for the Latin phrase "quod erat demonstrandum" ("that which was to be demonstrated"), a

notation

which is often placed at the end of a mathematical

proof

to indicate its completion. Several symbols are occasionally used as synonyms for Q.E.D. These include a filled square

filled square

or an empty square

 square

.

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