# 2Sum

2Sum is a floating-point algorithm for computing the exact round-off error in a floating-point addition operation. 2Sum and its variant Fast2Sum were first published by MΓΈller in 1965.Fast2Sum is often used implicitly in other algorithms such as compensated summation algorithms; Kahan's summation algorithm was published first in 1965, and Fast2Sum was later factored out of it by Dekker in 1971 for double-double arithmetic algorithms.The names 2Sum and Fast2Sum appear to have been applied retroactively by Shewchuk in 1997. (Wikipedia).

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## Related pages

Floating-point arithmetic | Kahan summation algorithm | IEEE 754 | Round-off error