Also found in: Dictionary, Thesaurus, Medical, Legal, Wikipedia.


fundamental operation of arithmetic; the inverse of addition. If a and b are real numbers (see numbernumber,
entity describing the magnitude or position of a mathematical object or extensions of these concepts. The Natural Numbers

Cardinal numbers describe the size of a collection of objects; two such collections have the same (cardinal) number of objects if their
..... Click the link for more information.
), then the number ab is that number (called the difference) which when added to b (the subtractor) equals a (the subtrahend). In terms of addition the symbol −b is called the additive inverse of b with the property that the sum of a number and its inverse equals 0, or b+(−b)=0. It follows that −(−b)=b. The subtraction of b from a is the same as the addition of a and the inverse of b, or ab=a+(−b); e.g., when a=10 and b=5, then 10−5=10+(−5).
The Columbia Electronic Encyclopedia™ Copyright © 2013, Columbia University Press. Licensed from Columbia University Press. All rights reserved.


The addition of one quantity with the negative of another; in a system with an additive operation this is formally the sum of one element with the additive inverse of another.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
[1] An algebra (X, -) is called a subtraction algebra if a single binary operation--satisfies the following identities: for any x,y,z [member of] X,
If the shapes were yellow, the bee would have to perform a subtraction operation (- 1).
In that case, subtraction is equivalent to addition of a negative number.
Next comes two-digit subtraction, and there is usually no problem with 96 - 52, since it is a pair of one-digit subtractions.
(ii) Ratio subtraction method: The amplitude values at 290 nm in the ratio spectra were subtracted from each ratio spectrum, followed by multiplication of the obtained spectra by the divisor (8 [micro]g/mL formoterol).
At the Ortigas/Makati Meditation Center, professional instructors guide practitioners with the subtraction method and always check their meditation progress in order to help them throw away their thoughts.
In practice this means we have an infinite cutoff and the renormalization is completely imposed by the five subtractions, unlike in [47-49] where the cutoff still plays a role since only one subtraction was performed for the N2LO potential which requires four subtractions to allow an infinite cutoff.
The image review criteria for positive finding were as follows: clear abnormal residual activity on the subtraction SPECT images that had an anatomic correlation in the CT images.
In the present study, the aim was to perform lung volume DIR for the reduction in misregistration artifacts in temporal subtraction images to enhance temporal changes in lung lesions and evaluate the changes after DIR.
"Teddy Bear Subtraction" is a delightful math education book from the McGrath Math series, which introduce simple math concepts such as counting, sets, and subtracting for beginners.
Teddy Bear Subtraction is a children's picturebook that uses illustrations of colored gummy bears to teach young people about the basics of subtraction, including the simple concepts of "sets", "greater than", and "less than".