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The copy editors polish the text for precision and conciseness. They attempt to understand the purpose of the writing and the intended audience; therefore, they ask questions such as where the document will be published and who will read it, and they edit accordingly. Proofreading, rather, is required during the last stage of the editing process.
P. Oxy. 29, one of the oldest surviving fragments of Euclid's Elements, a textbook used for millennia to teach proof-writing techniques. The diagram accompanies Book II, Proposition 5. [1] A mathematical proof is a deductive argument for a mathematical statement, showing that the stated assumptions logically guarantee the
BSI proof-correction marks (conforming to BS 5261C:2005) as prepared by the Chartered Institute of Editing and Proofreading; The style guide for publications of the European Union is presented in 24 European languages and includes a section on proofreading. Each edition has a sheet of proofreader's marks that appears to be the same apart from ...
PM can now write, and evaluate: (x) . ψx. The notation above means "for all x, x is a man". Given a collection of individuals, one can evaluate the above formula for truth or falsity. For example, given the restricted collection of individuals { Socrates, Plato, Russell, Zeus } the above evaluates to "true" if we allow for Zeus to be a man.
The beginning of a proof usually follows immediately thereafter, and is indicated by the word "proof" in boldface or italics. On the other hand, several symbolic conventions exist to indicate the end of a proof. While some authors still use the classical abbreviation, Q.E.D., it is relatively uncommon in modern mathematical texts.
Galley proofs in electronic form are rarely used as advance reading copies due to the possibility of a recipient editing the proof and issuing it as their own. However, trusted colleagues are occasionally offered electronic advance reading copies, especially if the publisher wishes to quickly typeset a page or two of "advance praise" notices ...
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In logical argument and mathematical proof, the therefore sign, ∴, is generally used before a logical consequence, such as the conclusion of a syllogism. The symbol consists of three dots placed in an upright triangle and is read therefore. While it is not generally used in formal writing, it is used in mathematics and shorthand.