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I'm looking for a technical name (if one exists) for a number that 'completes' or 'complements' another. The motivation for this is to develop a proper understanding of mathematical language, for example in naming variables while programming.

Say if I have a value x = 1/26. Is there a name for y = 25/26 that fills in the remaining part of the fraction?

In essence, if I have some x, I want a technical name for the value of y = (1-x).

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  • $\begingroup$ difference maybe? $\endgroup$ – JHance Aug 13 '14 at 17:23
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Complementary event probability, but it's a rather long name for a variable.

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    $\begingroup$ If $x$ were the probability of an event then $1-x$ would be the probability of the complementary event, not the complementary event itself. I'm not convinced a widespread snappy name for $1-x$ (in terms of $x$) exists, especially not outside of probability theory. $\endgroup$ – Clive Newstead Aug 13 '14 at 17:27
  • $\begingroup$ @CliveNewstead: Thank you for pointing that out (added "probability" to the answer). $\endgroup$ – barak manos Aug 13 '14 at 17:40

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