Hi, how do I express the set R− in interval notation? I know R is the set of all real numbers, but what is R− ?

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Hi, how do I express the set R− in interval notation? I know R is the set of all real numbers, but what is R− ?

Mathematics
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all negative real numbers
Oh, so R is only all *positive* real numbers?
So in interval notation, it would be (-inf, 0) ?

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(-inf,0)
The interval you've written is correct. \[ \mathbb{R} \] however is all real numbers: positive, negative and zero.
if it's just R then it's all numbers if it's R+ then positive, R- negative
\[ \mathbb{R}^+ = (0, \infty) \] \[ \mathbb{R}^+ = (-\infty, 0) \] \[\mathbb{R}_{\geq 0} = [0, \infty)\]
*correction (sorry!) \[ \mathbb{R}^- = (-\infty, 0) \]
thanks tomas and jamesj, it makes sense now

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