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anonymous
 4 years ago
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− ?
anonymous
 4 years ago
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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anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0all negative real numbers

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0Oh, so R is only all *positive* real numbers?

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0So in interval notation, it would be (inf, 0) ?

JamesJ
 4 years ago
Best ResponseYou've already chosen the best response.2The interval you've written is correct. \[ \mathbb{R} \] however is all real numbers: positive, negative and zero.

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0if it's just R then it's all numbers if it's R+ then positive, R negative

JamesJ
 4 years ago
Best ResponseYou've already chosen the best response.2\[ \mathbb{R}^+ = (0, \infty) \] \[ \mathbb{R}^+ = (\infty, 0) \] \[\mathbb{R}_{\geq 0} = [0, \infty)\]

JamesJ
 4 years ago
Best ResponseYou've already chosen the best response.2*correction (sorry!) \[ \mathbb{R}^ = (\infty, 0) \]

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0thanks tomas and jamesj, it makes sense now
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