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cancellation

cancellation The loss of significant digits in subtracting two approximately equal numbers. This is a frequent cause of poor accuracy in numerical results but it can usually be avoided by some reorganization of the calculation. Consider, for example, the quadratic equation ax2 + bx + c = 0

The formula for the roots of a quadratic is (–b ± √(b2 – 4ac))/2a

If b2 is large compared with 4|ac| severe cancellation occurs in one of the roots. This root can be computed from the fact that the product of the roots is c/a.

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cancellation

can·cel·la·tion / ˌkansəˈlāshən/ • n. the action of canceling something that has been arranged or planned: train services are subject to cancellation at short notice. ∎  a crossing out of something written. ∎  a visible or electronic mark placed on a postage stamp to show that it has been used. ∎  Law the annulling of a legal document.

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"cancellation." The Oxford Pocket Dictionary of Current English. . Encyclopedia.com. 18 Aug. 2017 <http://www.encyclopedia.com>.

"cancellation." The Oxford Pocket Dictionary of Current English. . Encyclopedia.com. (August 18, 2017). http://www.encyclopedia.com/humanities/dictionaries-thesauruses-pictures-and-press-releases/cancellation

"cancellation." The Oxford Pocket Dictionary of Current English. . Retrieved August 18, 2017 from Encyclopedia.com: http://www.encyclopedia.com/humanities/dictionaries-thesauruses-pictures-and-press-releases/cancellation