functions of a real returning respectively the largest smaller and the smallest larger integer
Wikipedia
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Floor and ceiling functions - Wikipedia
February 5, 2026 - In mathematics, the floor function is the function that takes as input a real number x, and gives as output the greatest integer less than or equal to x, denoted โxโ or floor(x). Similarly, the ceiling function maps x to the least integer greater than or equal to x, denoted โxโ or ceil(x).
Brilliant
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Ceiling Function | Brilliant Math & Science Wiki
The best way to learn math and computer science. Log in with Google Log in with Facebook Log in with email ... Already have an account? Log in here. ... The ceiling function (also known as the least integer function) of a real number \(x,\) denoted \(\lceil x\rceil,\) is defined as the smallest integer that is not smaller than \(x.\)
Videos
04:11
Floor and Ceiling Functions Explained Simply | Math is Fun - YouTube
17:07
Math 2200: Section 4.2 - Floor and Ceiling Functions - YouTube
05:00
[Discrete Mathematics] Floor and Ceiling Examples
36:51
Floor and Ceiling Functions, 2nd edition. - YouTube
05:09
Floor and Ceiling Functions - YouTube
What is the ceiling of a number if it is already an integer?
The ceiling of an integer is the given integer itself. For example, the ceiling of 3 is 3 only.
byjus.com
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Ceiling Function Definition
How to calculate the ceiling value?
The ceiling function is related to the floor function by the formula: โxโ=โโโxโ.
byjus.com
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Ceiling Function Definition
What is the ceiling of 4.3?
The ceiling of 4.3 is 5.
byjus.com
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Ceiling Function Definition
Mathematics LibreTexts
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1.4: The Floor and Ceiling of a Real Number - Mathematics LibreTexts
August 17, 2021 - From now on we mostly concentrate on the floor \(\lfloor x \rfloor\). For a more detailed treatment of both the floor and ceiling see the book Concrete Mathematics [5]. According to the definition of \(\lfloor x \rfloor\) we have \[\label{eq:1}\lfloor x\rfloor =\max\{n\in\mathbb{Z}\mid n\leq\}\] Note also that if \(n\) is an integer we have: \[\label{eq:2}n=\lfloor x\rfloor \Longleftrightarrow n\leq x<n+1.\] From this it is clear that \[{\mbox{$ \lfloor x \rfloor $}} \le x \mbox{ holds for all $x$},\nonumber\] and \[{\mbox{$ \lfloor x \rfloor $}} = x \Longleftrightarrow x \in \mathbb{Z}.\nonumber\] We need the following lemma to prove our next theorem.
Wolfram MathWorld
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Ceiling Function -- from Wolfram MathWorld
September 13, 2004 - The function [x] which gives the smallest integer >=x, shown as the thick curve in the above plot. Schroeder (1991) calls the ceiling function symbols the "gallows" because of the similarity in appearance to the structure used for hangings. The name and symbol for the ceiling function were coined by K. E. Iverson (Graham et al.
PlanetMath
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ceiling
The ceiling of a real number is the smallest integer greater than or equal to the number.
Microsoft Support
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CEILING.MATH function - Microsoft Support
Syntax: CEILING.MATH(number, [significance], [mode])
Wikimedia
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Wikimedia
Use this page to experiment with the MediaWiki REST APIs. API calls made through the sandbox interface will interact with live wiki content and may modify the wiki. Refer to the API documentation for further details about API usage
Maplesoft
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Ceiling Function - Math Terms & Solutions - Maplesoft
Compute and visualize floor and ceiling functions with Maple. In mathematics and computer science, the floor and ceiling functions map a real number to the greatest preceding or the least succeeding integer, respectively.
Top answer 1 of 3
275
\usepackage{mathtools}
\DeclarePairedDelimiter{\ceil}{\lceil}{\rceil}
The command \ceil will do; if called as \ceil*{x} it will add \left and \right; you can also call it as
\ceil[\big]{x} \ceil[\Big]{x} \ceil[\bigg]{x} \ceil[\Bigg]{x}
to state explicitly the size of the delimiters.
2 of 3
25
Here is a simple xparse implementation of \ceil, similar to that provided by mathtools' \DeclarePairedDelimiter:

\documentclass{article}
\usepackage{xparse}% http://ctan.org/pkg/xparse
\NewDocumentCommand{\ceil}{s O{} m}{%
\IfBooleanTF{#1} % starred
{\left\lceil#3\right\rceil} % \ceil*[..]{..}
{#2\lceil#3#2\rceil} % \ceil[..]{..}
}
\begin{document}
\[\ceil[\big]{x} \quad \ceil[\Big]{x} \quad \ceil[\bigg]{x} \quad \ceil[\Bigg]{x} \quad \ceil*[\big]{\frac{1}{2}}\]
\end{document}
The optional argument is ignored in the starred version of \ceil*[..]{..}.
Omni Calculator
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Ceiling Function Calculator
January 18, 2024 - Welcome to Omni's ceiling function ... popular math operation. In the short article below, we not only give the formal definition of the ceiling function but also: Explain intuitively what the ceiling function does to a number; ... Go together through some examples of ceiling function computation. The ceiling function maps a real number x to the smallest integer number that is greater than or equal to x: ... ๐ In the formula above, you can see the most widespread ceiling function symbol...
Google Support
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CEILING.MATH function - Google Docs Editors Help
CEILING: The CEILING function rounds a number up to the nearest integer multiple of specified significance. ROUNDUP: Rounds a number to a certain number of decimal places, always rounding up to the next valid increment. ROUND: The ROUND function rounds a number to a certain number of decimal ...
Mathwords
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Mathwords: Ceiling Function
Numbers & SymbolsSets, Logic, ProofsGeometryAlgebraTrigonometryAdvanced Algebra & Pre-CalculusCalculusAdvanced TopicsProbability & StatisticsReal World ApplicationsMultimedia Entries ... A step function of x which is the least integer greater than or equal to x. The ceiling function of x is usually written



