Multi-useroperating systems allow multiple users to utilise the computer and run programs at the same time.
The most obvious example being a Telnet server where multiple remote users have access to the Unix shell prompt at the same time.

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... any function f which can be expressed in the form
<math> f(x) = \int_{c}^{x} R(t,P(t))\ dt </math>
where R is a rational function of its two arguments, P ...