The symbol pm is written using the code pm in latex.
Floor of a fraction latex.
The command displaystyle will format the fraction as if it were in mathematical display mode.
Hyperbolic functions the abbreviations arcsinh arccosh etc are commonly used for inverse hyperbolic trigonometric functions area hyperbolic functions even though they are misnomers since the prefix arc is the abbreviation for arcus while the prefix ar stands for area.
Another option would be to look in the comprehensive latex symbol list in the external links section below.
Some say int 3 65 4 the same as the floor function others say int 3 65 3 the neighbouring integer closest to zero or just throw away the 65 so be careful with this function.
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Given real numbers x and y integers k m n and the set of integers floor and ceiling may be defined by the set equations.
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Greek letters are commonly used in mathematics and they are very easy to type in math mode.
It must have been in the context of math olympiads so i can t point to a book that uses it.
To write a fraction you use the code frac expression in the numerator expression in the denominator.
With the floor function we throw away the fractional part.
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That part is called the frac or fractional part function.
Wikipedia suggest this notation among others.
Inline formulas are sometimes squashed to avoid altering the height of the lines.
Look for detexify in the external links section below.
The usage of fractions is quite flexible they can be nested to obtain more complex expressions.
Making statements based on opinion.
On the other side textstyle will change the style of the fraction as if it were part of the text.
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But i ve seen this notation being used for the floor function.
Open an example in overleaf.
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In the latex typesetting system these symbols can be specified with the lfloor rfloor lceil and rceil commands in math mode.
Personally i would prefer x being a cleaner mix of lfloor x rfloor and lceil x rceil.