What is the origin of 'sleep tight'?

Read moreOne of the mysteries of the English language finally explained.

We use cookies to enhance your experience on our website. By continuing to use our website, you are agreeing to our use of cookies. You can change your cookie settings at any time.ContinueFind out more

The theorem that if a polynomial f(x) is divided by (x − a) the remainder will be f(a), the value of the polynomial for x = a.

Late 19th century.