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These are usually handwritten on the paper containing the text. Symbols are interleaved in the text, while abbreviations may be placed in a margin with an arrow pointing to the problematic text. Different languages use different proofreading marks and sometimes publishers have their own in-house proofreading marks. [1]
Question marks and exclamation points that denote a move as bad or good are ubiquitous in chess literature. [1] Some publications intended for an international audience, such as the Chess Informant , have a wide range of additional symbols that transcend language barriers.
In chemistry, superscripted plus and minus signs are used to indicate an ion with a positive or negative charge of 1 (e.g., NH + 4 ). If the charge is greater than 1, a number indicating the charge is written before the sign (as in SO 2− 4 ).
In mathematics, a negative number is the opposite (mathematics) of a positive real number. [1] Equivalently, a negative number is a real number that is less than zero. Negative numbers are often used to represent the magnitude of a loss or deficiency. A debt that is owed may be thought of as a negative asset. If a quantity, such as the charge ...
Responses to negative interrogative sentences can be problematic. In English, for example, the answer "No" to the question "You don't have a passport?" may confirm the negative, i.e. it means that the responder does not have a passport, but on the other hand, it can also imply that the responder does have a passport.
When the standard presumption that the plus-or-minus signs all take on the same value of +1 or all −1 is not true, then the line of text that immediately follows the equation must contain a brief description of the actual connection, if any, most often of the form "where the ‘±’ signs are independent" or similar.
In English writing, quotation marks or inverted commas, also known informally as quotes, talking marks, [1] [2] speech marks, [3] quote marks, quotemarks or speechmarks, are punctuation marks placed on either side of a word or phrase in order to identify it as a quotation, direct speech or a literal title or name.
He also writes that "no attempt has been made to explain why a tally of something should exhibit multiples of two, prime numbers between 10 and 20, and some numbers that are almost multiples of 10." [ 2 ] Alexander Marshack examined the Ishango bone microscopically, and concluded that it may represent a six-month lunar calendar .