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I've been seeing it a lot recently, and I'm not sure what it's called, and I've searching on google things like "$f(x)$ with a bar over it". Even just a name for it would be helpful $f(x)$ with a line over the entire thing

I'm tagging complex numbers because that's where I first saw the symbol

HeroZhang001
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1 Answers1

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The overline symbol is called a vinculum.

It groups symbols together and has several uses in mathematics,

including square roots, repeating decimals, and logical negation.

In the context of complex numbers, it denotes the complex conjugate.

J. W. Tanner
  • 60,406