Math Help - Whats the difference?

1. Whats the difference?

I was wondering.. What is the difference between:
(2, infinity) and {x: x > 2}

And also:
R^+ union {0} and [2, infinity)

Are these the same things written differently? And if so, if a question had the answer {x: x > 2} for example, and I wrote [2, infinity) instead, would I get it wrong? (Especially in exams)

2. Originally Posted by Klutz
I was wondering.. What is the difference between:
(2, infinity) and {x: x > 2}
these two say the same thing

And also:
R^+ union {0} and [2, infinity)
all non-negative real numbers ... x > 2

Are these the same things written differently? And if so, if a question had the answer {x: x > 2} for example, and I wrote [2, infinity) instead, would I get it wrong? (Especially in exams)
[2, infinity) includes the value 2 ... x > 2 does not
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