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In old Hewlet Packard calculators, it was common to have an int and a frac function, which were giving the integer and the fraction part of a number.

Nowadays, the floor function is quite common and noted $ \lfloor x \rfloor $ but to get fraction part, you usually need to compute it "by hand" by explicitly writing something like x - floor(x). I wondered if there existed some mathematical short hand notation for $frac(x) = x - \lfloor x \rfloor $.

Thank you.

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    $\begingroup$ Most common is $\{x\}$. $\endgroup$ – lulu Oct 25 '19 at 21:27
  • $\begingroup$ Thank you but why wouldn't you post this as a reply (which I could accept as the reply) ? $\endgroup$ – Camion Oct 25 '19 at 21:28
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As requested in the comments:

The standard notation for the fractional part of $x$ is $\{x\}$.

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