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An element a in a magma (M, ∗) has the left cancellation property (or is left-cancellative) if for all b and c in M, a ∗ b = a ∗ c always implies that b = c. An element a in a magma (M, ∗) has the right cancellation property (or is right-cancellative) if for all b and c in M, b ∗ a = c ∗ a always implies that b = c.
The cancellation property holds in any integral domain: for any a, b, and c in an integral domain, if a ≠ 0 and ab = ac then b = c. Another way to state this is that the function x ↦ ax is injective for any nonzero a in the domain. The cancellation property holds for ideals in any integral domain: if xI = xJ, then either x is zero or I = J.
In mathematics, a cancellative semigroup (also called a cancellation semigroup) is a semigroup having the cancellation property. [1] In intuitive terms, the cancellation property asserts that from an equality of the form a · b = a · c , where · is a binary operation , one can cancel the element a and deduce the equality b = c .
Project cancellation, in government and industry; Cancellation (mail), a postal marking applied to a stamp or stationery indicating the item has been used; Cancellation (insurance), the termination of an insurance policy; Flight cancellation and delay, not operating a scheduled flight
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The cancellation technique, with part of each term cancelling with part of the next term, is known as the method of differences. An early statement of the formula for the sum or partial sums of a telescoping series can be found in a 1644 work by Evangelista Torricelli , De dimensione parabolae .
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